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Physical Chemistry

Blazing goIITian

Joined:	26 Mar 2009
Post:	1428

6 Sep 2010 01:59:18 IST

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Second Law

None

When gas expands isothermally, we get dq+dw=0. This implies that all the heat is converted into work. This gives 100% efficiency which violated the second law of thermodynamics. Plz explain why....

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Comments (3)

Pranay Nailwal

Cool goIITian

Joined: 8 Jun 2010

Posts: 37

6 Sep 2010 10:38:18 IST

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the IInd law is better than Ist law cos it is the consequence of ist lawit removes anamolies of ist law.Sometimes in calculating thermodyanamic concept of energy it fails iind law but it is only theoretical data. and second law is more correct since it is based on practicle data

Aakash Anuj

Blazing goIITian

Joined: 26 Mar 2009

Posts: 1428

6 Sep 2010 22:48:46 IST

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dont say anything u like,....u r noway answering my query

Krishna Gopal Singh

Forum Expert

Joined: 29 Dec 2006

Posts: 4965

7 Sep 2010 23:05:40 IST

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Second law says that "For a cyclic process the efficiency cannot be more than carnot efficiency." The key word is cyclic process. When you talk of isothermal process it is not cyclic.

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