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Thermodynamics/Questions
| Subject | Date Asked | Expert |
| Entalphy | 12/8/2011 | Richard J. Raridon |
| Q: I am Mr Washington. According to my guidebook, enthalpy is the amount of heat energy in the system. ... A: I'm trying to convince you that you can only measure differences in both enthalpy and potential ... | ||
| Entalphy | 12/7/2011 | Richard J. Raridon |
| Q: I am Mr Washington. According to my guidebook, enthalpy is the amount of heat energy in the system. ... A: Total enthalpy of a system cannot be measured. Only differences in enthalpy can be measured. ... | ||
| Energy | 11/12/2011 | Richard J. Raridon |
| Q: Q.1) Define the following 1) Heat Energy 2) Mechanical Energy 3) Light Energy 4) Sound Energy 5) ... A: 1) Everything above absolute zero has heat energy that shows up as the movement of the atoms in the ... | ||
| Calorimetry | 10/13/2011 | Richard J. Raridon |
| Q: My chemistry teacher insists that calorimeters change temperature at the same rate as the liquid ... A: As you should know, water has the highest specific heat of any material. Since calorimeters are ... | ||
| Thermodynamics | 9/22/2011 | Richard J. Raridon |
| Q: Sir, How can you best use a spoon to cool a cup of coffee? Stirring-which involves doing ... A: Yes, stirring might add a minute amount of heat but the coffee loses most of its heat through the ... | ||
| Heat transfer in metal bowl? | 8/12/2011 | Richard J. Raridon |
| Q: Raridon, a friend of mine asked me an interesting question during a dinner prep and I had to admit I ... A: I'm sure it's not true that they didn't heat up at all. Aluminum is a good conductor and also a ... | ||
| Chloride concentrations. | 6/22/2011 | Richard J. Raridon |
| Q: I am in my last year of High School and for a chemistry project we were titrating samples. My ... A: I don't believe heat would release any chlorine from any of those salts so it's a mystery as to why ... | ||
| Gas compression and pressure. | 5/23/2011 | Richard J. Raridon |
| Q: My Assumptions: 1. Cooking Gas(LPG), will be in gaseous state at Room temperature and pressure. So, ... A: You may have seen a demonstration using liquid nitrogen. By keeping it in a thermos you can keep it ... | ||
| Physics | 3/15/2011 | Richard J. Raridon |
| Q: A 20.0 g copper ring has a diameter of 2.54000 cm at its temperature of 0.000 oC. An aluminum sphere ... A: I sent the first copy of this question on to the question pool. It's easy enough to calculate the ... | ||
| chemistry | 2/8/2011 | Richard J. Raridon |
| Q: what is log?why we take log?what is the significance of log?please give me answer in a clear words ... A: We use logs to simplify some calculations. Logs can be taken for any base, but usually 10. The log ... | ||
| Would this be possible with plastic water bottles? | 11/23/2010 | Richard J. Raridon |
| Q: I stumbled upon this website and was wondering if it would be possible to create this in my backyard ... A: There's physics behind the idea. If you fill a bottle with water and set it in the sun, the water ... | ||
| Absolute Zero - what happens? | 11/16/2010 | Richard J. Raridon |
| Q: I have a question related to what happens at absolute zero. My High School science teacher once told ... A: I doubt that your teacher was able to cool something to near absolute zero since this takes very ... | ||
| Heat | 7/8/2010 | Richard J. Raridon |
| Q: I don't know much about physics or forms of energy, but pretty much all energy ends up being heat ... A: Heat energy is sort of the low end of the scale. Almost all forms of energy, potential, kinetic, ... | ||
| Thermodynamics | 5/6/2010 | Richard J. Raridon |
| Q: I'm in 7th grade and I go to Middle School. I have been assigned a project that requires me to ... A: I'm retired so I don't do anything regularly on a day-to-day basis. I volunteer here at the science ... | ||
| thermodynamics | 5/2/2010 | Richard J. Raridon |
| Q: At sea level, what pressure would water need to be kept under in order to raise its temperature to ... A: The reason you can't duplicate my solution is because the vapor pressure of water as a function of ... | ||
| uranium, plutonium in 99Mo | 3/26/2010 | Kevin |
| Q: i have read up on the production of 99Mo for medical use. The reference is ... A: It is very hard to tell from a simple description of the procedure what the effectiveness of the ... | ||
| how hot is a 60 watt bulb | 3/18/2010 | Kevin |
| Q: I would like to know how hot a 60 watt light bulb gets, will you please answer my question? Thanks! A: It depends on the type of bulb. An ordinary incandescent bulb has a coil of tungsten in it that ... | ||
| aggregation of plutonium dioxide/plutonium in physisorption scenario | 3/14/2010 | Kevin |
| Q: hope you can really help as i really need it. you see, my orthopedic recommended me and i did a ... A: I think your concerns are a little bit over elaborate. The final checks on medical radiation ... | ||
| Freezing CD's | 3/12/2010 | Kevin |
| Q: Some people have said that by freezing compact discs you can improve their sound. You freeze then ... A: Let me start by saying that listening to music is the single most subjective thing we humans do ... | ||
| Heat transfer | 3/12/2010 | Kevin |
| Q: I work for a company that is in to renewable energies. PV solar for the most part. However, we are ... A: The major mechanism of heat loss from such a tank is convection of air form the sides, top and ... | ||
| four stroke engine | 3/11/2010 | Kevin |
| Q: my question is, how much force apply on the piston head during the combustion process A: It varies a lot depending on engine type, cycle, application, piston size and compression ratio. But ... | ||
| thermodynamics | 3/8/2010 | Kevin |
| Q: Respected sir, Can u explain me what is the difference between motor cycles with gears and gearless ... A: I am not an expert on motorcycles but as I understand it gearless motor bikes have CVT (Continuously ... | ||
| heat content | 3/8/2010 | Kevin |
| Q: Do all pure object in their typical states( I mean oxygen as molecule and iron as atom) have ... A: Purity is not the issue. Only Elements, that is matter that cannot be chemically broken down or ... | ||
| heat content | 3/6/2010 | Kevin |
| Q: Do all pure object in their typical states( I mean oxygen as molecule and iron as atom) have ... A: Yes, this is correct. All pure elements at 25°C and 1 atm have an enthalpy of zero. Care is needed, ... | ||
| Modelling | 3/5/2010 | Kevin |
| Q: In order to model the solubility of CO2 in salts in deep geological settings what do I need? A: You will need as a minimum the following:- Pressures Temperatures Comosition of local geology in ... | ||
| second law of thermdynamics | 3/4/2010 | Kevin |
| Q: how do you explain these situations using the second law of thermodynamics a) the pre-med students ... A: The second law is mostly about entropy, that is the tendency of systems to move to more random ... | ||
| chemical reaction | 3/1/2010 | Kevin |
| Q: ok so Calcium Carbide and water yeilds Acetylene and Calcium Cyanide yields Hydrogen Cyanide so not ... A: In a word no. Calcium exists almost exclusively as a compound in the +2 state. Carbide balances that ... | ||
| Hydrogen-oxygen explosion | 3/1/2010 | Kevin |
| Q: Why is there a flash of light when the hydrogen-oxygen explosion occurs and how could you find out ... A: The reaction between oxygen and hydrogen is very exothermic (gives out a lot of heat). As it happens ... | ||
| heat | 2/18/2010 | Kevin |
| Q: how much heat for the 1000watts lighting bulb hql 1000 ANSWER: Hi jay, Effectively an incandesant ... A: It is the similar except more of the wattage is emitted as light than an incandescent bulb drawing ... | ||
| Thermodynamics | 2/16/2010 | Kevin |
| Q: Please help me help my daughter answer this question "A 25 g sample of food is burned in a ... A: You need to find how many calories have gone into heating up the water. 300 mg (?) have been heated ... | ||
| Rijke tube | 2/5/2010 | Kevin |
| Q: I am building a type of Rijke tube for a science fair project. I was wondering if you knew what is ... A: I think the heated element needs to be quite hot in order to shift the volume of air needed. They ... | ||
| evaporation of water in a container | 1/25/2010 | Kevin |
| Q: I’m trying to get a high level of evaporation of water in a container with an external vacuum. ... A: The main thing do remember is that as the water turns to vapor it takes a lot of heat out with it. ... | ||
| burning calories with cold water | 1/18/2010 | Kevin |
| Q: 1 gallon of water weights 8.6 pounds 1 BTU is energy needed to raise 1 pd. water 1 degree F 252 ... A: Dieticians do not usually understand thermodynamics and as a result what they call a 'calorie' we ... | ||
| Energy transferrence | 1/13/2010 | Kevin |
| Q: My question is that suppose we put a spring which is in its original state undeformed into an ... A: Let us take the case of the coil of metal uncompressed first. This is simply taking a metal and ... | ||
| Terraforming | 1/10/2010 | Kevin |
| Q: Suppose we dedicated a very powerful nuclear reactor with an existing, long-lived catalyst to ... A: Getting a very high powered nuclear reactor to Mars would be hideously expensive. However assume we ... | ||
| Chemistry - insulators | 1/10/2010 | Kevin |
| Q: I need to explain why are ceramics good insulators? Im pretty sure im suppose toe explain heat wise ... A: Solid conductors such as metals have electrons that are available to conduct charge at very low ... | ||
| phase change | 1/8/2010 | Kevin |
| Q: my name is venky. i am studying my third btech in mechanical engg in india. first i will give some ... A: If we take water as an example it can exist as ice (solid) water (liquid) and steam (gas). If we ... | ||
| Heat and Colors | 1/5/2010 | Kevin |
| Q: Why do dark colors absorb and transfer heat at a greater rate than do light colors in an environment ... A: Colour is caused by reflected light. A white object reflects a large proportion of visible light. A ... | ||
| 200 watt light bulb | 12/28/2009 | Kevin |
| Q: Is is safe to use a 200 watt lightbulb in my bedside lamp? A: Generally speaking the shade on the light fitting is the critical factor. You should not exceed the ... | ||
| Do temperature and pressure always act the same? | 12/12/2009 | Kevin |
| Q: I've heard that pressure, or any potential, always acts the same as temperature. For example: ... A: To answer your general question first. Increasing temperature and pressure both increase the rate of ... | ||
Kevin
Top Expert on this page
Expertise
Chemical thermodynamics, kinetics, reaction thermochemistry and aspects of combustion.
Experience
I am the head of a major chemical companys thermochemistry and safety testing lab.
Organizations
Ciba Expert Services
Education/Credentials
BSc and MSc from Sheffield University
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