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WHAT IS THE CORRECT STATEMENT OF FIRST LAW OF THERMODYNAMICS? WHAT IS ITS CORRECT EQUATION.
IN OUR CHEMISTRY BOOK & PHYSICS BOOK THEY HAVE GIVEN DIFFERENT EQUATIONS.
ALSO TELL WHEN WORK DONE IS POSITIVE & WHEN IS IT NEGATIVE ?
SAUMYA
Dear Saumya
In Physics
U=Q-W
when work is done by the system W is positive and when work is done on the system W is negative
When heat is given to system Q is positive and when heat is given by the system Q is negative
In Chemistry
U=Q+W
when work is done by the system W is negative and when work is done on the system W is positive
Hence both are same with a difference in sign convention only.
All the best.
AKASH GOYAL
AskiitiansExpert-IIT Delhi
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