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About Richard J. Raridon
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Any in general physics category

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Have taught general physics several years

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MA in physics

 
   

You are here:  Experts > Science > Chemical Engineering > Thermodynamics > thermodynamics

Topic: Thermodynamics



Expert: Richard J. Raridon
Date: 7/15/2008
Subject: thermodynamics

Question
Hi...

1) In BOYLE's law when graph is plotted between pressure on x-axis and volume on y-axis at constant temrarure,isotherm is obtained. When temprature is increased and graph is plotted between volume and pressure at this new constant temrature a new curve is obtained which is far away from both axis. Plz explain why curve move away from both axis???

2)In BOYLE's law when graph is plotted between pressure on y-axis and 1/v on x-axis at constant temrarure,a straight line is obtained. When temprature is increased and graph is plotted between 1/v and pressure at this new constant temrature a new straight line is obtained which is away from both 1/v axis. Plz explain why the sraight line move away from 1/v axis???  

Answer
1) You're plotting PV = RT where R is the gas constant.  At constant T, you get a curve of V vs. P.  Obviously, if you increase T you get a new isotherm which cannot cross the old one.  
2) Here you're plotting P = (1/V)RT and again you have an isotherm.  If you increase T the line has to move away since it can't cross the old one.

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