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![[Post New]](/templates/default/images/icon_minipost_new.gif) 10 Nov 2006 00:25:47 IST
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we write internal energy as nc(at constant volume)t[where n is the no of moles and t is the change in temperature]...my question is tht why do we write at constant volume and not in constant pressure?
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10 Nov 2006 10:55:17 IST
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From the first law of thermodynamics then heat given to a gas is divided into two things , change is internal engery + the work done by the gas.
So, we write the internal energy of the gas in terms of constant volume, because if some heat is given to the system then at constant volume the work done by the system will be zero (  P dV ) , and all the energy will be used to increase the internal energy of the system that will be nc(at constant volume)t[where n is the no of moles and t is the change in temperature].
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Rahul A
-- If you thing you can, you can. If you think you can't, you're right !! -- |
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10 Nov 2006 16:55:10 IST
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Yo!!!
Rahul good work done ... absolutely correct answer !!!!!!
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Puneet Agrawal
IIT Delhi
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