| Subject | Date Asked |
|
| desalinisation | 11/23/2009 |
Q: I am from Adelaide in South Australia. This is the driest and sometimes the hottest place in the ...
A: An original thought. However, it is beset with problems. The first of which is how are you going to ...
|
| Open Window cooling | 11/11/2009 |
Q: I have been wondering; how can one measure or use a formula to find the cooling done in a room by an ...
A: There are several factors which have to go into the model. One is the difference in temperature ...
|
| Thermoelectric Generators? | 11/8/2009 |
Q: If I'm correct thermoelectric generators are used to convert heat into electricity. Why don't they ...
A: These devices are very inefficient (5-8%) and can only usefully be considered with waste heat. They ...
|
| LPG Vs Petrol Vs Ethanol | 11/2/2009 |
Q: I am currently doing a chemistry assignment on the validity of using LPG or pure Ethanol (not a mix ...
A: This is too long and involved for me to do so I will supply some brief answers/suggestions. Q1. You ...
|
| Atomic Structure | 10/26/2009 |
Q: I am an eighth grade student and we have been asked to interview a chemist. I would appreciate it ...
A: Q1 You read the label on the jars! But if there is no label there are a series of tests that you do ...
|
| 8th grade interview | 10/26/2009 |
Q: Hey in am eighth grader and I have been asked to interveiw an expert so I was wandering if I could ...
A: Q1. Yes at one point in my career I was responsible for making a range of phenol derivatives as pure ...
|
| how salt effects boiling water | 10/11/2009 |
Q: I've heard several times that salt makes water boil faster and that is why people add it to the food ...
A: Adding salt to water allows the salt to be spread evenly throughout the water. Water has to be ...
|
| physics | 10/10/2009 |
Q: The outside diameter of a wheel is 1m. An iron tire for this wheel has an inside diameter of .992m ...
A: You need to treat the hoop as a straight piece of iron. The piece is 0.992m and needs to be 1.001m. ...
|
| Thermodynamics | 10/8/2009 |
Q: Why does residual Gibbs energy have a link to experiment while Gibbs energy does not? In other ...
A: This is a difficult and profound question and lies at the root of why chemical reactions occur at ...
|
| Printer Cartridge | 10/5/2009 |
Q: I watched a show called "How They do It" on the Discovery Channel. This is a Canadian science ...
A: This is a popular science show not a university lecture so a lot of "poetic license" is in use to ...
|
| chem question | 10/4/2009 |
Q: Hey I've been stuck on this question for over 2 hours from an old test of one of my professors. ...
A: You need to know how many moles of each (H2S and SO2) are present to do this is easy with the H2S as ...
|
| dyne | 10/2/2009 |
Q: i want to ask what is the history of a dyne as a unit? i mean who invented it and how did it come ...
A: We now work in the KMS or SI system, kilogram, meter, second. In other words all are units are based ...
|
| thermodynamics | 10/2/2009 |
Q: i am studynig metallurgy engineering and have 2 questions. first i want to know what is the ...
A: Thermodynamics is that subset of Physical chemistry which concerns itself with heat. As opposed to ...
|
| thermodynamics | 9/25/2009 |
Q: I understand that the combustion of a hydrocarbon releases thermal energy and visible light energy ...
A: The light emitted from burning a hydrocarbon is a function of the way in which the reaction is ...
|
| Steel expantion | 9/24/2009 |
Q: How do I detriment the growth of oil field casing when heat (steam) is apply. Casing is ran and ...
A: No stretching the pipe will not work. Metal expands and contracts as it is heated and cooled. This ...
|
| Steel expantion | 9/23/2009 |
Q: How do I detriment the growth of oil field casing when heat (steam) is apply. Casing is ran and ...
A: The steel will grow by 12 X 10^-6 of its original length (1.000012 times) for every 1°C temperature ...
|
| Radium Clock | 9/17/2009 |
Q: Q1. Can a small amount of Radium be used to charge an electroscope? Q2. If so, can you use the ...
A: The basis of the whole thing is radioactive decay. The unstable radium nucleus wants to split into ...
|
| Liquid Nitrogen | 9/17/2009 |
Q: What technology do scientists use to create liquid nitrogen?
A: It is just basic engineering using compressors, pumps and valves. Basically they take air and ...
|
| Radium Clock | 9/16/2009 |
Q: Q1. Can a small amount of Radium be used to charge an electroscope? Q2. If so, can you use the ...
A: A1. Yes I have done this experiment when I was at school and radium will cause an electroscope to ...
|
| Wood flame vs. C4N2-O3 flame -- which emits more radiant heat? | 9/14/2009 |
Q: A dicyanoacetylene-ozone [C4N2-O3] flame reaches a temperature of 5516 K. This causes it to emit EM ...
A: "Since IR generates more heat on human skin than UV of the same intensity" This is not true. UV is ...
|
| Do yellow flames emit more infrared than blue flames? | 9/12/2009 |
Q: Does a yellow bituminous coal flame give off more infrared radiant heat than a blue methane flame? ...
A: The amount of radiation of any specific wavelength (UV, Visible, IR) given out by a flame is ...
|
| thermodynamics | 9/8/2009 |
Q: i have problem in understanding that "in a cyclic process the internal energy of a system remains ...
A: If you take a tank of gas (A) compress it to half its volume heat it to 100°C expand it to its ...
|
| Specific heat capacity | 8/30/2009 |
Q: hey i was just wondering what is the specific heat capacity of ethanol, methanol and propan-1-ol? ...
A: The specific heats are Methaanol 0.57 Ethanol 0.54 Propan-1-ol 0.52 cal/g K. The normal procedure ...
|
| bonding in thermochemistry | 8/27/2009 |
Q: hey kevin i'm doing some work on thermochemistry in the form of calorimetery. i'm doing the three ...
A: Bond energies are published in many documents. They can be used to estimated the heat of reaction ...
|
| dangarous radiation | 8/25/2009 |
Q: could you help me please I want to ask you some iq about dangarous radiation ...
A: All radiation is part of the electro-magnetic radiation spectrum. At one end are low energy radio ...
|
| Water evaporation mass and volume | 8/24/2009 |
Q: I am trying to understand how water evaporates. My current understanding is that water molecules ...
A: A GAS FILLS ALL SPACE EQUALLY (OVER TIME). Why? Is it because the molecules are pushing away from ...
|
| Loading road vehicles in a refinery. | 8/24/2009 |
Q: Working on a bitumen plant, we load road vehicles(one at a time or several),from bitumen storage ...
A: Without looking at your system directly I can only guess. If you are pumping bitumen out of a ...
|
| thermodynamics | 8/24/2009 |
Q: please tell me why we do not use the symbol of degree when we refer to kelvin scale.for example why ...
A: The old temperatures (°F, °C etc) were based on the fixed melting and boiling of various pure ...
|
| Water evaporation mass and volume | 8/24/2009 |
Q: I am trying to understand how water evaporates. My current understanding is that water molecules ...
A: ---------- FOLLOW-UP ----------Hi Kevin Thank you for your answer. You are getting there but, I am ...
|
| Water evaporation mass and volume | 8/24/2009 |
Q: I am trying to understand how water evaporates. My current understanding is that water molecules ...
A: Your basic idea of molecules of water "bouncing" around is sound if unsophisticated. More accurately ...
|
| comparing different energies | 8/20/2009 |
Q: Can you tell me how one goes about answering thisHow big does a compressed air tank have to be so ...
A: If you assume that the engine is 2.0 l capacity in both cases and that it takes 1.0 l of air to ...
|
| Cooling hot equipment in space? | 8/18/2009 |
Q: In short, my question is this: if you have something hot in space (in a spacecraft for instance), ...
A: The answer is that space is very cold 3K or -270°C. Once in true space, away from our Sun, it is ...
|
| physics of cold water | 7/25/2009 |
Q: I wanted to know why ice cubes would have a spike of ice in them near the middle, at about a 20 ...
A: This is thought to be caused by the water in the center freezing more slowly than the water at the ...
|
| a bottle of steam | 7/21/2009 |
Q: My name is Nicolae Gari, and I would like to thank you for your previous answers several months ago. ...
A: Well here goes, water boils when its vapour pressure equals the pressure of the gas above it. On ...
|
| a bottle of steam | 7/20/2009 |
Q: My name is Nicolae Gari, and I would like to thank you for your previous answers several months ago. ...
A: In deep space if we open a bottle of water the water will start to boil. The boiling will be ...
|
| Heat transfer rate | 7/20/2009 |
Q: Kevin, I asked this question earlier today, but was mistaken as a home work question. It is ...
A: You are in the specialist area of heat transfer. I cannot go into detail here as the limited fonts ...
|
| a bottle of steam | 7/20/2009 |
Q: My name is Nicolae Gari, and I would like to thank you for your previous answers several months ago. ...
A: It works like this. Water always has some of its molecules as a gas above it (as steam or vapour). ...
|
| Chemistry | 7/18/2009 |
Q: Why does a blue flame on a Bunsen burner produce carbon dioxide as on of the products? ANSWER: Hi ...
A: There does not need to be any hydrogen for things to burn. In the case of carbon monoxide CO the ...
|
| Flame temperature and power | 7/16/2009 |
Q: A 1kg block of concrete is exposed to a flame burning at 1000°C. The specific heat capacity of ...
A: Not enough information to help you here, sorry. If the flame is very small (say a match) then a 1kg ...
|
| Ice Engine | 7/11/2009 |
Q: Will you please help me with some suggestions on how to build my invention, the ICE ENGINE? Here ...
A: 1. Heat transfer (to freeze and melt water) is dependent on three main factors: surface area, ...
|
| Chemistry | 7/9/2009 |
Q: Why does a blue flame on a Bunsen burner produce carbon dioxide as on of the products?
A: A Bunsen burner is burning a gas called methane. This is a gas made from carbon and hydrogen and is ...
|
| entropy | 7/5/2009 |
Q: What is meant by entropy?
A: Entropy is a property of matter. It is in effect a measure of the randomness of the molecules or ...
|
| Combustion of Methane gas | 7/5/2009 |
Q: I need to calculate the volume of the products of combustion when burning 0.72 M3/HR of Methane when ...
A: I do not fully understand your question so let me give you a few ideas to start with. If we assume ...
|
| House heating | 6/29/2009 |
Q: In Scandinavia a lot of new and refurnished houses are heated with an underfloor water distibution ...
A: It will also depend on heat losses from the home. These arise from the following areas. Ground Roof ...
|
| House heating | 6/28/2009 |
Q: In Scandinavia a lot of new and refurnished houses are heated with an underfloor water distibution ...
A: You are thinking entirely along the right lines. A thicker floor only delays the heat from getting ...
|
| Nuclear Weapons | 6/19/2009 |
Q: On which distance battleship could survive average nuclear explosion? Also, which effects explosion ...
A: Nuclear weapons are very devastating at short ranges. A medium sized nuclear bomb would destroy ...
|
| thermodynamics | 6/18/2009 |
Q: what is the difference between internal energy and enthalpy?
A: In the absence of an external field, the enthalpy may be defined, as it is generally known, by: H ...
|
| rates of thermal transfer | 6/8/2009 |
Q: Kevin. In using solar power (direct rays) to heat water by pumping it through .5 inch diameter ...
A: It would be best to leave the water out. The problem is that water will evaporate and then condense ...
|
| Metal expansion | 6/4/2009 |
Q: EN 19 Shaft, 50mm dia, 8000rpm, 700mm long, 10 hour duty cycle with medium/heavy load (rotating load ...
A: AS I said I cannot find a value for EN19 grade steel. You may be able to get it from the supplier. ...
|
| steel roofsheeting | 6/3/2009 |
Q: we are rollforming steel roofsheeting in 65meter lengths on site,the question of linear expansion ...
A: Assuming it is ordinary carbon steel the length will increase by 10.8 X 10^-6 of the original length ...
|
| coeficient of thermal expansion various mtl | 6/3/2009 |
Q: I have a 29 foot long steel tube supporting a 29 foot long aluminum rafter with 29 feet of ...
A: Steel 10.8, aluminum 23 and fibreglass 30 all X 10^-6 for every deg C. Note +50F = +28C So your ...
|
| evaporation point of gold | 5/30/2009 |
Q: My parents have been volunteering to go into areas devastated by the black saturday bushfires in ...
A: Well a few facts first the temperature reached in fires rarely exceeds 1260 Deg C. ...
|
| Heat transmission | 5/29/2009 |
Q: How do you get a thermal equilibrium during heat transmission?
A: Heat transmission requires there to be a hotter and a colder place so that net heat can be ...
|
| loss of heat in water in Geothermal pumping | 5/20/2009 |
Q: Can you entertain a question about loss of heat potential while pumping up hot water through a ten ...
A: In general terms heat loss is dependant on three things. 1. Temperature difference. The greater the ...
|
| Linear expansion of steel wagon wheel tyres | 5/17/2009 |
Q: My father has a wagon wheel that he needs to tighten the steel tire(tire's dimensions are 4inch wide ...
A: If the wheel is 2m in diameter and the fire is at 500C then the wheel will expand to 2.012m ...
|
| Chemical Engineering Thermodynamics: Gibbs energy | 4/30/2009 |
Q: Greetings. Sir, would you mind to explain to me why we need to define the residual gibbs ...
A: In thermodynamics, the Gibbs free energy (IUPAC recommended name: Gibbs energy or Gibbs function) is ...
|
| force on a gas | 4/29/2009 |
Q: The question I sent was not a homework question.I am not taking any courses.I simply want to know ...
A: This is a complex area and I have not time to go into the level of detail you require in addition ...
|
| heat | 4/29/2009 |
Q: Sorry, my home tongue is not English... I want to know how do the thermal inductance and ...
A: You can detect infrared radiation by placing your hand (or any bit of skin) near (but not on, or ...
|
| heat | 4/29/2009 |
Q: Sorry, my home tongue is not English... I want to know how do the thermal inductance and ...
A: I have not heard of thermal inductance. A decibel meter measures sound waves. Sound waves travel ...
|
| Temperature stability | 4/17/2009 |
Q: Can you please let me know upto what temperature copper( oxygen free) is stable mechanically. Say I ...
A: The thing with most metals is to avoid temperatures at or even near the melting point as they tend ...
|
| Expansion Rates of Cylindrical Metal | 4/16/2009 |
Q: How does one calculate the bore growth (in thousandths of an inch) as it relates to rise in ...
A: What actually happens when you heat a metal is that it expands in three dimensions uniformly. So the ...
|
| vapor | 4/14/2009 |
Q: if I have a pure oxygen gas how can i make a dense (thick) vapor of oxygen ?.......... thank you for ...
A: You need oxygen under pressure in a a container. Then you need to cool this towards the liquid state ...
|
| query on Fe2Cl6 | 4/8/2009 |
Q: What are the products when you heat diironhexachloride, iron (3) chloride again or iron(2) chloride ...
A: Iron(III) chloride has a relatively low melting point and boils at around 315 °C. The vapour ...
|
| How do we know about direction of Magnetic field | 4/1/2009 |
Q: I know that the magnetic field travels from the North To the South....My ? is how is it that we ...
A: A magnet, if a bar or the earth has two poles and a non magnetic center. If to have two identical ...
|
| geothermal abstract | 3/30/2009 |
Q: I would really like to thank you for your previous answer. My name is Nicolae Gari, and I have a ...
A: The problem here is that natural convection does not work very well in narrow pipes or holes. This ...
|
| Volume of water changes with temperature | 3/29/2009 |
Q: How to Design a laboratory experiment to investigate how the volume of a given amount of water ...
A: You need a lot of water and a thin bore glass tube. Take a 1 liter flask and fit to it a rubber ...
|
| sentry fireproof boxes | 3/28/2009 |
Q: I was looking at a sentry fireproof safe box earlier. I'm not sure of the model. Anyway from the ...
A: There are several ways they make boxes fire proof for a time. (note no box will remain fireproof for ...
|
| time for water temperature to drop | 3/27/2009 |
Q: My name is Nicolae Gari and I'm a student. Lets say I have a regular house room at temperature T1. ...
A: Given a tank at T1 and a room at a lower temperature T2 provided you know the mass in the tank and ...
|
| Can you please check my answers | 3/26/2009 |
Q: I have solved these questions but not really sure if they have been solved correctly by me.I will be ...
A: In the first question you have made an error in assuming that nitrate (NO3) splits into N and O it ...
|
| Thermodynamics | 3/21/2009 |
Q: Cooling heated, pressurized gas with water. A spherical container of 10 in^3 volume contains hot and ...
A: To make it cheap and cheerful. Ignore the effect of the container and also the heat needed to get ...
|
| linear expansion of steel | 3/18/2009 |
Q: I am installing 25' steel I-beams to support the perpendicular wood beams under my house. I want to ...
A: The linear coefficient of thermal expansion of steel is 12 x 10^-6 per °K. You have 7.62m of steel ...
|
| need help with a question | 3/18/2009 |
Q: I have a question plese help me out. A solid consists of a mixture of NaNO3 and Mg(NO3)2. When 6.50 ...
A: The extent of freezing-point depression can be calculated by applying Clausius-Clapeyron relation ...
|
| Cooling rates of immersed steel | 3/18/2009 |
Q: If two pieces of steel were heated to red hot and immersed fully into different but identical large ...
A: There would actually be very little difference between the two. The major mechanism of heat loss ...
|
| heat loss calculations | 3/17/2009 |
Q: I work with warehouse & logistics company. We are trying home-grown ways to block cold air coming ...
A: I guess you have a forced air heating/circulating system in the warehouse or static radiators. In ...
|
| Bio-mass Gasification Power Plant | 3/16/2009 |
Q: Respected Sir, My name is Ali Asghar and I am a student of final year in B.S engineering. ...
A: Step One:- Find a cheap, plentiful supply of easily collected and stored bio-mass. (Rice waste, ...
|
| Spontaneity of a Reaction | 3/13/2009 |
Q: I am trying to understand a question on my chemistry test, but my teacher cannot explain it. How do ...
A: You really do not have enough information to determine the nature of the reaction. Wether a reaction ...
|
| Science Project | 3/10/2009 |
Q: I am trying to find a topic for my extra-credit science project. My science average at the moment is ...
A: How about you investigate the efficiency of the lay-out and arrangement inside a domestic micro-wave ...
|
| steam production | 3/8/2009 |
Q: how many heat is needed to produce steam at 7 ATM from water at 40 Celsius degrees ? thanks Kim
A: If you assume that you want to do this with 1 kg of water then you need to calculate three heats and ...
|
| PV | 3/5/2009 |
Q: good evening sir, i am venky. i asked you a question and you replied that this service is only for ...
A: Sorry I did not have time to answer your original question. This link is excellent and if you follow ...
|
| experimental errors | 3/4/2009 |
Q: Concerning to gas properties study, it's correct to think that is molar volume V the measure more ...
A: It will depend on the conditions. If you are working with a fixed volume then the volume can be ...
|
| Dust into water | 2/28/2009 |
Q: recently i saw a nasa experiment on their site which explained how they turned artificial lunar dust ...
A: The moon is made up of many different types of rock just like the Earth is (without the sedimentary ...
|
| Maximum temperature a structure is theoretically able to withstand. | 2/28/2009 |
Q: This is for a project I am doing. Is it possible to shield a large area from extremly high ...
A: The maximum temperature materials can stand without falling apart is in the region of 3500 deg C. ...
|
| thermal expansion in a fuel hose/ pressure increases | 2/24/2009 |
Q: Kevin, I have a question about thermal expansion of fuel in our fuel hoses here in Iraq. I have 500 ...
A: The coefficient of thermal expansion for fuels is approx 950ppm per degree C. If your temperature ...
|
| Properties of Water | 2/24/2009 |
Q: I hope this is not too simple of a question. I know water has the property of high specific heat ...
A: All matter has the capacity to absorb heat. I you apply heat (by convection, conduction or ...
|
| Kelvin Scale | 2/20/2009 |
Q: What are the disadvantages to using the Kelvin scale for temperatures, and also if it is absolute, ...
A: Any scale for temperatures can be valid. I understand and use F, C, and K as I have used them all at ...
|
| Combustion | 2/18/2009 |
Q: While looking online for the heat of combustion for Magnesium, I came across two different numbers. ...
A: The difference is between a mole of substance and a Kg of substance. A Kg I am sure you understand. ...
|
| air heat capacity & Stanton number | 2/10/2009 |
Q: I´m looking for values of the air heat capacity per unit of volume (express in J m-3 K-1) and values ...
A: The heat capacity of dry air is 1.01 kJ kg-1 K-1. The density of dry air at 20C and 760 mm is 1.2047 ...
|
| spherical combustion chamber | 1/31/2009 |
Q: I am designing a replacement for the piston-based engine (Pat.pending 11/542,023) and am ...
A: This is turbine engine technology about which I know little. All I can say is, that if it was me, I ...
|
| magnetic | 1/26/2009 |
Q: i wonder how strong would a magnetic field have to be in order to repel an ion gas like he+2 about ...
A: An ion trap is a highly complex computer controlled electrical and magnetic force manipulation ...
|
| magnetic | 1/26/2009 |
Q: i wonder how strong would a magnetic field have to be in order to repel an ion gas like he+2 about ...
A: This is impossible to set up. Charged gas ions are high energy, high velocity and tiny. They are ...
|
| Fire | 1/25/2009 |
Q: I am a fire instructor needing assistance in describing what the state of fire is? My students asked ...
A: Well the four element theory was derived by thinkers not scientists. And they thought wrong. Their ...
|
| pressure | 1/20/2009 |
Q: Consider a U-tube whose arms are open to the atmosphere. Now water is poured into the U-tube from ...
A: The height of the Oil (O) and Water (W) must be equal to the other leg 70 cm. Thus 70=O+W. They say ...
|
| reversible process | 1/19/2009 |
Q: sir i am trying to understand thermodynamics but not ableto understand one specific topic i,e ...
A: Do not get to concerned about the exact definition. Many processes are effectively reversible (i.e. ...
|
| entropy | 1/16/2009 |
Q: Good evening sir, I am venky.My question is as follows. I know that entropy is a measure of ...
A: Entropy is not deltaQ/T. Change of entropy deltaS is =deltaQ/T. Entropy S is given by Kb X lnOmega. ...
|
| Heat loss over time in a cylinder | 1/14/2009 |
Q: I've got a heat loss problem I've been searching my old thermo text books for an answer with no ...
A: What you need here is the surface area of system. This will have a heat loss rate per unit area that ...
|
| gravitu | 1/14/2009 |
Q: 1..If a rocket is launched from appoint under the earth by 4 example 40 km did the energy consumed ...
A: 1. This will need more energy than a surface launch. The extra energy will be that required to raise ...
|
| heat loss | 1/10/2009 |
Q: Will the heat gain in the room from an elc. oven after you have turned it off be the same with the ...
A: The heat gained by the room will be the same it will just take longer for the oven to cool with the ...
|
| Salt and Ice | 1/3/2009 |
Q: Why does salt melt ice faster than just letting the ice melt by itself?
A: Ice and water always exist together. There is always a small amount of water on solid ice. Salty ...
|
| hydrocarbons | 12/29/2008 |
Q: . i wanted to know a few reasons why Hydrocarbons are imporant..the only ones i could think off is ...
A: It is true that we burn hydrocarbons to keep us warm but we also burn them to, make electricity and ...
|
| Converting CO2 into oxygen and carbon? | 12/12/2008 |
Q: Is it possible to get rid of excess CO2 on earth by splitting carbon dioxide into carbon and ...
A: We know that there have been ice ages and periods where the world was a lot hotter than it is now, ...
|
| Iron Furnace | 12/11/2008 |
Q: I learned from a friend of mine that there used to be huge Iron furnaces fueled by charcoal that ...
A: Iron is made from iron oxide which is found in the earth as an ore. In order to convert it to iron ...
|
| Not-so-hot sparks can still ignite. Why? | 12/11/2008 |
Q: The electrostatic sparks from a CRT TV screen, while they maybe a bit comfortable [or even painful], ...
A: Sparks are very hot indeed. They have very high temperatures. That is why they ignite flammable ...
|
| Questions about hydrogen flames. | 12/11/2008 |
Q: I'm getting a bit confused about this http://en.wikipedia.org/wiki/Oxyhydrogen "The maximum ...
A: The maximum temperature of flames is always near the stoichiometric mix and usually slightly ...
|
| Converting CO2 into oxygen and carbon? | 12/11/2008 |
Q: Is it possible to get rid of excess CO2 on earth by splitting carbon dioxide into carbon and ...
A: It is perfectly possible to split any combination of atoms back to their atomic form. So we can ...
|
| thermal expansion | 12/1/2008 |
Q: In 1702 Amontons discovered a linear volumetric expansion of any gas (of equivalent volume) to be ...
A: As a general rule a gas expands by 1/273 of its volume for every degree C the temperature rises. ...
|
| thermodynamics | 11/28/2008 |
Q: Where can I find the physical properties of specific cooking oils? Specifically the volume ...
A: Sorry none of my sources have this data. I guess folk just want to cook with the stuff! The best I ...
|
| What is convective heat measured in? | 11/24/2008 |
Q: The intensity of radiant heat [which is EM radiation] is measured in ...
A: One question at a time. The induced convection of the air is the Venturi effect where a moving ...
|
| steam | 11/23/2008 |
Q: I am making woodpellets but I need to heat the sawdust hot enough to activate the lignin in the ...
A: Steam will come off boiling water at 212F, way short of your 240F requirement. This means that you ...
|
| thermodynamics | 11/22/2008 |
Q: 1)Referring to the previous session;you said that when a piston experienced heat loss due to ...
A: I can only answer your last question about mixing gases CO2 and dry air. Your assumption is wrong ...
|
| What is convective heat measured in? | 11/20/2008 |
Q: The intensity of radiant heat [which is EM radiation] is measured in ...
A: Surface loss applies to solid surface. Flames radiate, mass transfer heat (hot exhaust gases) and ...
|
| heat | 11/20/2008 |
Q: I don't know if you can help me out with this one...I need to challenge my friend with a question on ...
A: The heat required to boil water is 40.65 kJ per mol. A mol of water is 18 g. 2 kg of water has ...
|
| thermodynamics | 11/19/2008 |
Q: 1)Referring to the previous session;you said that when a piston experienced heat loss due to ...
A: 1. The percentage of heat that is generated by friction will depend on the geometry of the system. ...
|
| Magnesium Combustion | 11/18/2008 |
Q: How much light is emitted by burning magnesium in air? ANSWER: Hi Ted, It is a difficult question ...
A: The flame temperature for magnesium burning in air is quoted as 2500K. At this temperature there is ...
|
| que | 11/18/2008 |
Q: do you think the laws of thermodynamics will apply to antimatter without any variation?
A: Tough one to guess. However the known laws of physics have applied to the generation, cooling and ...
|
| heat | 11/18/2008 |
Q: I don't know if you can help me out with this one...I need to challenge my friend with a question on ...
A: Ask your friend to tell you how long it will take a 1kW kettle to boil off 2 kg of steam starting ...
|
| colder bodies | 11/18/2008 |
Q: Is it possible for an object to have temperature below -273 degree centigrade?. If it is not ...
A: Temperature is an effect of motion in atoms. Atoms and molecules (collections of atoms) buzz about ...
|
| Follow-up to dicyanoacetylene question | 11/17/2008 |
Q: Sorry to bother you with another carbon-subnitride/ozone question. This is a follow-up question to ...
A: You are assuming ideal burning conditions. Where oxidant and organic matter burn efficiently. This ...
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| Magnesium Combustion | 11/17/2008 |
Q: How much light is emitted by burning magnesium in air?
A: It is a difficult question to answer exactly as it will depend a lot on the geometry of the fire and ...
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| RF cooling?! | 11/17/2008 |
Q: Just how can microwaves be used to cool something? Usually they heat things up. ...
A: Not for years to come and never directly. It is a way to get to very cold temperatures like ~1K ...
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| thermodynamics | 11/16/2008 |
Q: why two ice piece merges together when kept attached reason should be in context with thermodynamics
A: Two pieces of ice in contact are in fact six pieces. This is because Ice and Water always exist ...
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| RF cooling?! | 11/15/2008 |
Q: Just how can microwaves be used to cool something? Usually they heat things up. ...
A: It is a near quantum effect. Specifically tuned radiation (RF) is used to dampen oscillation in a ...
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| delta H vs Q | 11/15/2008 |
Q: I often see delta H and Q used interchangeably (i.e I have seen the equation Q = mass x specific ...
A: As a general rule delta H is used for heats of formation and Q should be reserved for heat of ...
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| Heat transfer through pyrex glass | 11/11/2008 |
Q: This is probably a new question for you!! We are trying to grow these little creatures called ...
A: I think any screen has an effect. A good way to check this out is to place your hand above and below ...
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| thermodynamics | 11/8/2008 |
Q: A force pushes a piston in a cylinder,compressing a gas adiabatically.Is the amount of force that is ...
A: The critical temperature for a gas in dry air is fixed. So long as the gas is above that temperature ...
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| thermodynamics | 11/7/2008 |
Q: A force pushes a piston in a cylinder,compressing a gas adiabatically.Is the amount of force that is ...
A: When a piston experiences friction most of the force is lost as heat. This loss will be to the walls ...
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| perpetual motion machine | 11/5/2008 |
Q: Is their any chance of a 100 percent efficient machine, that can generate more power than it uses? I ...
A: Sorry, but there is absolutely no chance whatsoever. Honestly, just think about it for one moment. ...
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| water heater | 11/5/2008 |
Q: how much temp. loss in my 300ltr hot water tank if a circulating pump operates 4 hrs per day in a ...
A: Hard to say without a lot more tedious detail. The biggest hit will be when the pump first operates ...
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| combustion of petrol in I.C.E. | 11/4/2008 |
Q: I am writing a Maths/Physics article using F1 as a starting point. For one example I use a value ...
A: Sorry but I have no data on internal combustion engine efficiencies. It is know that partial ...
|
| chemistry - hydrates | 11/3/2008 |
Q: Zn(ClO3)2.xH2O cantains 21.5% zinc by mass. what is the value of X. Please do it step by step.
A: This is a question about atomic mass. The atomic masses involved are Zn=65.38 Cl=35.45 O=16 H=1 So ...
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| chemistry | 11/1/2008 |
Q: I'm having trouble with a prelab question. I would really appreciate if someone could answer this - ...
A: Columns of liquid have a mass and in order to stay as a column and not collapse back into the ...
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| x-ray machine | 10/31/2008 |
Q: I'm not sure if i'm in the correct area, but i thought i'd give it a shot anyways. So here it goes: ...
A: If you look at the periodic table of the Elements and pick out Nb (niobium) then move to the left ...
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| Chemistry | 10/30/2008 |
Q: When solid is heated, before melting(phase change),the kinetic energy increases.. May I know what ...
A: As the solid or liquid under goes a phase change its potential energy is increasing as the new phase ...
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| Thermocouple Instrumentation of Aluminum | 10/28/2008 |
Q: I have been struggling to find a consistent and solid method to attach 0.5 mm Type-K thermocouples ...
A: Measuring surface temperatures is notoriously difficult. The best surface thermometers are flat and ...
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| Help Needed! | 10/27/2008 |
Q: Hey Mr. Kevin , I need help with two problems. I tried doing them,,i got lost couple of times..i ...
A: You use the fact that Momentum is always a constant. Momentum is Mass X Velocity. The momentum of ...
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| some momentum and energy | 10/27/2008 |
Q: Hey Mr. Kevin, hope your doing great. I take AP physics and right now i am having a really hard time ...
A: I will not solve this for you but here is what you must do. You use the laws of gravity to ...
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| Heating and freezing Bouncy Balls | 10/25/2008 |
Q: I'm working on a science project about how temperature will affect the rebound on a regular rubber ...
A: First you need a good solid floor surface near a wall. Fix a mark on the wall to drop the ball from. ...
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| thermodynamics | 10/21/2008 |
Q: What are the examples can you think of that show thermodynamics properties in our everyday life?? ...
A: Try this. Put a kilo of water at 14C in your electric kettle and bring it to the boil, just. Now ...
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| Chemistry 102 General Chemistry | 10/20/2008 |
Q: How many kilocalories are required to change the temperature of 80.0g of water from 23.3 degree ...
A: This sounds like a home work question so this is the help I will give. Each 1g of water takes 1 ...
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| Latent heat of fusion & specific heat of water | 10/15/2008 |
Q: If you put ice(or more specifically snow) under pressure, does it alter the amount of heat required ...
A: Solids and liquids are generally incompressible so pressure has little effect on latent heats or ...
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| Would octaoxygen with dicyanoacetylene make the hottest flame? | 10/14/2008 |
Q: Dicyanoacetylene [C4N2] is the hottest burning fuel. However, the allotrope of oxygen used is just ...
A: Thats a lot of questions! Here goes in the order asked. Flame mixes are difficult to predict but ...
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| Would octaoxygen with dicyanoacetylene make the hottest flame? | 10/14/2008 |
Q: Dicyanoacetylene [C4N2] is the hottest burning fuel. However, the allotrope of oxygen used is just ...
A: A pure stoichiometric flame is not the hottest, for kinetic reasons and under practical conditions, ...
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| Would octaoxygen with dicyanoacetylene make the hottest flame? | 10/10/2008 |
Q: Dicyanoacetylene [C4N2] is the hottest burning fuel. However, the allotrope of oxygen used is just ...
A: It is not due to the extra number of oxygen atoms but more due to the more reactive nature of ozone ...
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| physics | 10/4/2008 |
Q: An aluminum cup weighing 120g contains 150g of hot water at temperature of 75ºC. What is the final ...
A: This sounds like a homework question. You need to assume that there are no heat losses to the air ...
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| chemical effects on wood | 10/2/2008 |
Q: working with wood and metal and to be honest I'm not sure who to ask for help, science is not one of ...
A: Good effects can be got from a cool bunsen flame on wood also with a hot bunsen flame on metals. ...
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| Physic -- Heat | 10/2/2008 |
Q: Heat one end of 2 similar metal rods of different thickness, which will allow heat to travel through ...
A: More heat will pass down the thicker rod, as the equation shows, but heat will travell faster down ...
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| chemical effects on wood | 10/1/2008 |
Q: working with wood and metal and to be honest I'm not sure who to ask for help, science is not one of ...
A: An interesting question. First off PLEASE if you are going to use chemicals be very careful. You ...
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| A question about effiency | 9/29/2008 |
Q: First of all, this is not a homework question, I repeat, it's not homework, I just need some ...
A: The only difference I can see in your question is that in one case it is (1-Q) and the other has ...
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| scienceeee | 9/28/2008 |
Q: .. i need you to help me understand the patterns in group 1-7 in the periodic table..what am i meant ...
A: The atoms react in fixed proportions with each other. Hydrogen only has one attachments at a time, ...
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| universal gas constant | 9/28/2008 |
Q: I would like to know what universal gas constant's significance is and what the different R values ...
A: The universal Gas constant R is 8.314472 J x K^-1 x mol^-1. It is the Energy (J) in a gas per Kelvin ...
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| Hydrogen Fuel Cells | 9/26/2008 |
Q: Sir I have a question about hydrogen fuel cells i want to know how they work; i mean our teacher ...
A: A fuel cell works by oxidizing the fuel with air. The hydrogen is fed into the cell and split into ...
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| specific heat | 9/23/2008 |
Q: i have a couple of questions about specific and latent heat, which i hope you can help me on. 1) ...
A: The specific heat is the heat required to raise (or lower) the temperature of a mass. When a mass is ...
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| chemistry | 9/22/2008 |
Q: what is the diferrence between ions and radicals
A: Ions are charged positive or negative. Radicals have no charge but have very reactive electrons ...
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| water + sodium hydroxide + electric current => Hydrogen + Oxygen + ? | 9/9/2008 |
Q: This experiment as we commonly know produces "brown's gas" or HH0. But, may I know the exact ...
A: Well done on making your own hydrogen! Please be careful with it as when mixed with air it will ...
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| Thermo: Addition of steam to a tank | 9/7/2008 |
Q: A well-insulated tank is of volume 70 cubic meters. Initially, it contains 25000 kg of water ...
A: This looks a bit like a homework type question so I can only outline what you need to do. The ...
|
| Thermodynamics in Space | 9/4/2008 |
Q: If I wished to evaporate a potentially toublesome iron-composition asteroid, at a great distance ...
A: Simplest to assume that our troublesome asteroid is pure iron. This will in any event give us a ...
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| water + sodium hydroxide + electric current => Hydrogen + Oxygen + ? | 9/4/2008 |
Q: This experiment as we commonly know produces "brown's gas" or HH0. But, may I know the exact ...
A: I have never heard of "Brown's gas" and cannot find it in the literature. It is certainly NOT the ...
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| latent heat | 8/21/2008 |
Q: sir i hav few questions related to latent heat. In my text book it is given that latent heat ...
A: It is best to think of latent heat of fusion (ice to water) as the energy needed by the ice to ...
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| Coefficient of volume for expansion of mercury | 8/11/2008 |
Q: A glas thermometer contains 1 cubic centimetre of mercury. If the column of mercury is 0.5mm in ...
A: Lets do step one Volume of a cylinder V. V=Pi r^2h. We have V=1cc, Pi=3.145, r=0.25mm (half ...
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| Coefficient of volume for expansion of mercury | 8/11/2008 |
Q: A glas thermometer contains 1 cubic centimetre of mercury. If the column of mercury is 0.5mm in ...
A: This looks like a homework question so I am not going to answer it for you. However, I will tell you ...
|
| Convective to radiative heat, how does it morph? | 8/7/2008 |
Q: Conversion of chemical (convection) to radiative (photonic) heat... What determines the rate at ...
A: All bodies above 0.0 K give out heat as light. The higher the temperature of the body the more heat ...
|
| Thermodynamics | 7/24/2008 |
Q: I have a question about my hot tub. On a hot day the temperature can actually go above my comfort ...
A: Kinda tough this one. Hot tubs generally run on a thermostat to control the tub temperature (that is ...
|
| Nichrome wire melting temp? | 7/18/2008 |
Q: Would 40 gauge Ni-Chrome Wire melt and break if heated to 2170 degrees Fahrenheit in an electric ...
A: Ni-chrome wire typically melts at 2550 F and so would not melt at 2170F. The melting temperature is ...
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| Thermodynamics | 6/25/2008 |
Q: I have 1m squared heat collectors 1 of copper and 1 of 5mm thick HDPE plastic. Could you please show ...
A: The standard way to tackle this is to carry out two runs under identical conditions on each ...
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| Heat Loss | 6/23/2008 |
Q: I recently purchased a 215 gallon 3 person hot tub. I have 2 options for electrical connection. ...
A: On a cold winter night the jets alone will not supply sufficient kinetic energy to overcome the heat ...
|
| Activation energy | 6/20/2008 |
Q: Does activation energy depend on temperature? please explain!
A: No. The activation energy is derived from the slope of a plot of rate of reaction v temperature. It ...
|
| Arrhenious equation | 6/18/2008 |
Q: Sir, What are the limitations and boundaries of the basic Arrhenius equation and where is it derived ...
A: Rather than me write it all out for you can I recommend this excellent article on Wikipedia. ...
|
| What material is best used in my cooling system? | 5/31/2008 |
Q: i hope you will help me out with this one. Im try to make a cooling system for my new computer, its ...
A: Ice is by far the best material to use as it holds more "cold" than any other easily available ...
|
| Global Warming | 5/29/2008 |
Q: I am a Research Associate from INDIA and carrying out my research on Global Warming. Actually I am ...
A: Yes it is true. Sound is a vibration through a medium (air, water or land). Heat is also a vibration ...
|
| universal gas constant | 5/16/2008 |
Q: Could U please tell me why we show the universal gas constant by "R" ? It is very important to me. ...
A: Generally speaking the person who first publishes a set of equations gets to choose what letters to ...
|
| ICE | 5/8/2008 |
Q: Why is it when I take a bottle of water out of the fridge it freezes but yet it is not frozen when I ...
A: The phenomenon is known as supercooling. Many liquids can be cooled below their freezing points and ...
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| thermodynamics | 5/5/2008 |
Q: Mark bought a cup of coffee inbetween classes, but when it arrives its too hot to drink and he asks ...
A: It does make a difference. Hot bodies (the coffee) cool faster than colder bodies. So that if he ...
|
| Gibbs free energy | 4/30/2008 |
Q: Is Gibbs' free energy and delta internal energy the same? If not, then what is delta internal ...
A: Gibbs free energy G is defined as G=U + pV - TS Where U is the internal energy, p is pressure, V is ...
|
| Termodynamics | 4/28/2008 |
Q: How many BTU's does it take to reaise one gallon of water one degree
A: Oh boy! BTU's....Gallons and I suppose you mean one degree F? Ho Hum Let me do it my way first ...
|
| Heat Capacity | 4/25/2008 |
Q: I am looking to find the specific heat of humid air at a given temp and RH% at sea level.
A: Dry air at 25oC and sea level has a heat capacity of 1.0035 J/g/K. Typical Room air is 1.012 under ...
|
| Coloured-flame Alcohol Lamps | 4/24/2008 |
Q: A friend of mine (not very net-savvy) wishes to produce alcohol lamps which burn with a coloured ...
A: I am sorry I have never seen an alcohol lamp without a conventional wick. I can only think of what ...
|
| thermodynamics | 4/22/2008 |
Q: The Specific heat capacity of ice is 0.5cal/g/degrees Celcius. Suppose it remains at this until ...
A: The equation you need is the heat to raise one g of ice from -273 to 0 (0.5 x 1 x 273) then add the ...
|
| Fluid comprision | 4/18/2008 |
Q: The comprission ratio for gasoline is much lower than for diesle.But what happens if the gas ...
A: Any flammable liquid has a diesel ignition point. So if you increase the compression ratio on a ...
|
| thermodynamics | 4/6/2008 |
Q: how to find the final state of steam using the fact that Q=540kJ steam quality =0.8 P=200kPa and ...
A: Use the tables to find the temperature of steam at 200kPa in oK. Assume the volume is fixed at 1 m3. ...
|
| Pure Substance carbon dioxide | 4/2/2008 |
Q: Carbon dioxide is been charged in a bottle as Pressure = 1800 psi Temperature = 70 deg F Bottle ...
A: The critical temperature for CO2 is 31.1oC and your start temperature liquid CO2 will be present but ...
|
| fabrication of Hydrolyser | 4/1/2008 |
Q: my question simply is this: what is a hydrolyser?what is it used for?how is it designed? or better ...
A: Hydrolysers are used in several different industries all for slightly different purposes. In essence ...
|
| Enthalpy & internal energy/Delta E=Delta H | 3/31/2008 |
Q: When water is exothermic, meaning it releases heat, making delta H negative. the enthalpy is lower ...
A: You are cofusing heat (enthalpy) with temperature. They are not the same thing. As for the gases ...
|
| alcohol evaporation | 3/27/2008 |
Q: My husband and I can't agree. Can a glass that once held alcohol still have "alcohol residue" on ...
A: The answer is quite complex. Alcohol is volatile and so escapes into the air all the time from ...
|
| a Vacuum Chamber Battery concept | 3/12/2008 |
Q: I was thinking about if vacuum chambers could be utilized to slowly let compressed air back in ...
A: Oh air piston engines, not turbines. Yes even here the problem is keeping the temperature of the ...
|
| a Vacuum Chamber Battery concept | 3/10/2008 |
Q: I was thinking about if vacuum chambers could be utilized to slowly let compressed air back in ...
A: Yes this is entirely possible. All that is required is to create an object whose density is less ...
|
| a Vacuum Chamber Battery concept | 3/10/2008 |
Q: I was thinking about if vacuum chambers could be utilized to slowly let compressed air back in ...
A: I think that an air driven turbine such as used in an air driven car is not a heat engine as such. ...
|
| a Vacuum Chamber Battery concept | 3/8/2008 |
Q: I was thinking about if vacuum chambers could be utilized to slowly let compressed air back in ...
A: I am not exactly clear what it is that you propose. If it is just a vacuum chamber into which air ...
|
| Is a Carbon subnitride [dicyanoacetylene] fire non-toxic? | 3/4/2008 |
Q: Dicyanoacetylene [carbon subnitride] produces that hottest type of fire. Does it burn clean, like ...
A: Definitely not. The problem is that dicyanoactetylene contains two nitrogen atoms. These form NOx ...
|
| Is a Carbon subnitride [dicyanoacetylene] fire non-toxic? | 3/2/2008 |
Q: Dicyanoacetylene [carbon subnitride] produces that hottest type of fire. Does it burn clean, like ...
A: The simple answer is no. As the material contains an enoumous amount of nitrogen when it burns in ...
|
| thermodynamics | 2/28/2008 |
Q: how can i use the clapeyron equation to work out the melting point at which a substance melts given ...
A: You use this form of the equation. dP=L x dT/(T x dV) Where dP is the pressure difference (Delta ...
|
| thermodynamics | 2/25/2008 |
Q: i want to know more about chemical kinetetics.....can you explain more details for me about the rate ...
A: In essence chemical reactions are caused by molecules of the reacting chemicals bumping into each ...
|
| Universe as a thermodynamic system | 2/20/2008 |
Q: can we assume the universe as a whole is a large ,closed and isolated thermodynamic system so that ...
A: Wow what a question! We can assume anything we like...but is it realistic? In the overall order of ...
|
| thermodynamics | 2/20/2008 |
Q: a resistance R1 is connected in parrallel with a reisitance R2,what resistance R3 most be connected ...
A: 1.The resistance of the two parallel resistors Re is equal to 1/R1+1/R2. 2.The resistance of these ...
|
| Dissolving a substance | 2/20/2008 |
Q: when a substance such as an ionic compound is dissolved, how is dissociation endothermic and ...
A: In general in order to separate the ions one from another (+ from -) (dissolution) requires work. ...
|
| heet capacity | 2/18/2008 |
Q: the entherpy of formation of a compound Al2Cl6 from its element in their standard state,for the ...
A: The heat of reaction -1073.4 is equal to the heat of formation of the starting materials 6Na + ...
|
| What exactly are "flames"? | 2/16/2008 |
Q: What exactly are "flames"? From what I've read about, it's where atoms are rearranging, with a net ...
A: Lets start with incandescent gases. It is quite possible to excite a gas until it is incandescent. ...
|
| solving this problem ? | 2/12/2008 |
Q: i'm student from high education msc. (thermal engineering)engineering college , my quastion below . ...
A: I am not going to do the question for you but here is the method. Assume that the compressor is 100% ...
|
| Thermodynamics exp. | 2/7/2008 |
Q: My teacher asked me to make up an experiment, using a small test chamber to react two chemical ...
A: Step one you need an easily controlled and not too hot exothermic reaction. This one you can carry ...
|
| thermodynamics | 2/5/2008 |
Q: state and state the function of thermodynamics
A: The fuction of thermodynamics is to study and understand the interaction of heat and matter. For ...
|
| Latent heat...i think.. | 1/17/2008 |
Q: so i have a question on my physics worksheet and i can't figure out if I'm suppose to use a specific ...
A: This is fluid dynamics and I am not really an expert. I think you need this form of the Berboulli ...
|
| bowling water in 110 degrees? | 1/11/2008 |
Q: i'm sebastien, is it posible that water in the boiling pot with potatoes or the kittle just with ...
A: In an ordinary kettle or pot the temperature when the water is boiling will be 100C everywhere. The ...
|
| thermodynamics | 1/8/2008 |
Q: how 2nd law of thermodynamics shows the relation between entropy and spontaneity?
A: In simple terms, the second law is an expression of the fact that over time, differences in ...
|
| Napalm crossed with paintball | 1/6/2008 |
Q: I have learned that mixing gasoilen and styrofome produses what I beleive to be napalm. Then I ...
A: I think not. This is because when a fuel air mixture (diesel or gasolene) is compressed rapidly in a ...
|
| equations of state | 1/5/2008 |
Q: what the peng-robinson equations of state and how use it for calculation the termodynamics ...
A: The Peng Robinson equation of state can be used to determine physical properties of substances such ...
|
| Thermodynamics - refrigeration -air conditioning | 1/5/2008 |
Q: Prof. Kevin, I am trying to build a better mouse trap (air conditioner) so to speak. I have ...
A: Well I know very little about refrigeration systems so I cannot answer your last two questions. ...
|
| calorimetry | 1/4/2008 |
Q: "sir since you are expert in thermodynamics i have one question relatede to calorimetry 1) A ...
A: I find this question and the answer given very confusing. The additions are 400g(5C) + 200g(10C) ...
|
| Sound to Heat | 12/13/2007 |
Q: Is it true that noise pollution can produce some heat in the atmosphere? Please explain..
A: Yes it is true. Heat is transfered in three ways conduction, convection and radiation. In ...
|
| how the nuclear explosion form the fireball? | 12/12/2007 |
Q: Are the nuclear explosion fireball consist of fires and huge mushroom like-smoke?
A: The fire-ball is actually mostly plasma. Plasma is a form of matter which is quite rare. The most ...
|
| cremation | 12/9/2007 |
Q: In the cremation process,are all of the human bodies including muscles and bones are vaporized or ...
A: Burning organic matter is much the same if it is trees, animals or coal. The basic event is the ...
|
| heat capecity | 12/8/2007 |
Q: heat capecity hello I am a high school student and i want to ask you a question you know that ...
A: The Heat Capacity Cp is both phase and temperature dependant. The Cp is the amount of energy that ...
|
| fire and nuclear explosion | 12/6/2007 |
Q: Can a very hot fire and an nuclear explosion vaporize humans bones and steel into vapour and atoms?
A: Lets deal with the nuclear explosion first. The temperatures reached in, or near, a nuclear ...
|
| help | 11/30/2007 |
Q: please i would like to know if u could help me; i want to transport pvc powder from an overhead silo ...
A: This is perfectly possible. It is called pneumatic (the p is silent and it is pronounced ...
|
| Amount of melted ice | 11/25/2007 |
Q: If i want to know how much ice melted in a system, how do i compute that? For example i add 5Kg of ...
A: It starts with the Heat of Fusion of ice. That is the amount of heat needed to melt one kg of ice. ...
|
| Why are magnetic field lines always depicted as pointing from north to south? | 11/18/2007 |
Q: Southern magnetic energy is emitted from the side of a magnet taking in the lines of force. Northern ...
A: It is always dangerous to argue from an analogy. You should only ever use an analogy as an ...
|
| Most efficient heating | 10/27/2007 |
Q: WHEN BURNING WOOD (in an oven); WE SEEK TO REDUCE OXYGEN; SUCH THAT IT BURNS LONGER; IS THERE A ...
A: A given quantity of wood in a stove will always give out the same amount of heat. Restricting the ...
|
| methane and ethane | 10/24/2007 |
Q: 1-in the reaction of methane with chlorine why oxygen stops this reaction? 2- would you please show ...
A: The reaction of Chlorine with methane is a free radical reaction. Under the influence of light (the ...
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