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Thermal Physics

Blazing goIITian

Joined:	26 Mar 2009
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14 Sep 2009 22:51:25 IST

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While working out the problems , I find the conventions of thermodynamics of physics and chemistry c

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While working out the problems , I find the conventions of thermodynamics of physics and chemistry contrary . Plz help me with this problems and give me the solutions so that I can remember them and make no mistakes in both these subjects

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Shivam Srivastava... Got A Sunshine, now its my turn to get ultimate Pride ... :)

Blazing goIITian

Joined: 1 Jun 2008

Posts: 1625

15 Sep 2009 22:22:15 IST

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See the easiest sol'n for this problem , which i too follow is that you firstly take any book [ basic level ] , read that & make your self short notes related to Points To Remember , Formulas used to solve questions , etc etc & while solving the questions put that copy or notes with you ! Definitely you will find everything managed , & u also will easily solve all the questions !!!

TRY IT ONCE ,,,,,,

Best Of Luck , Cheers !!! ..... \\ S //

AIR 538 Asish

Blazing goIITian

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17 Sep 2009 13:51:39 IST

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in physics work done by gas is taken as postive while in chem work done by gas is taken as -ve

praveen kumar singh...thinking

Blazing goIITian

Joined: 19 Aug 2009

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17 Sep 2009 14:13:56 IST

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in physics work done by gas is taken as postive while in chem work done by gas is taken as -ve

now turn the equation of first law of thermodynamics as accord.then every thing is fine

ronakgupta

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Joined: 17 Sep 2009

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26 Sep 2009 10:12:50 IST

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in physics work done in expansion is taken as positive and work done in contraction is taken as negative due to the signs of dV. the equation for first law of thermodynamics is Q=U+W. heat added is negative and heat released is possitive.

in chemistry we follow the SI convention. heat added to the system is positive and heeat expelled is negative. Work done in expansion of the gas is work done BY the system and is thus negative. In conttraction work is done ON the system and is thus positive. The equation for first law of thermodynamics is U=Q+W.

Soumen Goswami

Forum Expert

Joined: 10 Apr 2007

Posts: 1777

3 Oct 2009 18:20:43 IST

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Good answer ronak.

Finally, it doesn't matter which convention u choose. Both are manifestation of the same physical law of energy conservation and any convention applied properly will five u correct answers

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