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saumya shivhare Grade: 11
        

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

6 years ago

Answers : (2)

AKASH GOYAL AskiitiansExpert-IITD
419 Points
										

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


When heat is given to system Q is positive and when heat is given by the system Q is negative


Hence both are same with a difference in sign convention only.


 


All the best.                                                           


AKASH GOYAL


AskiitiansExpert-IIT Delhi


 


Please feel free to post as many doubts on our discussion forum as you can. We are all IITians and here to help you in your IIT JEE preparation.


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6 years ago
AKASH GOYAL AskiitiansExpert-IITD
419 Points
										

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


When heat is given to system Q is positive and when heat is given by the system Q is negative


Hence both are same with a difference in sign convention only.


 


All the best.                                                           


AKASH GOYAL


AskiitiansExpert-IIT Delhi


 


Please feel free to post as many doubts on our discussion forum as you can. We are all IITians and here to help you in your IIT JEE preparation.


Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.


Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..


 


 




6 years ago
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