Question

Write signconventions used in first law of thermodynamics

Answer 1

hey mate....In physics class, we write the first law of thermodynamics as dU=dQ−dW and in the physical chemistry class, we write the same law as dU=dQ+dW. The reason being the sign convention is different in both the cases. In physics we take work done by the system as positive and in chemistry work done on the system.

Answer 2

Answer:

w=-ve for by the system work

W=+ve on the system work

q=+ if heat is taken by system

q= -if heat is given