Question

the sign (negative or positive)of work being done on the system or on the surroundings

the sign (negative or positive)of work being done on the system or on the surroundings

Homework Answers

Answer #1

work done on the system --------------------> positive

work done on the surroundings ---------------------> negative

explanation :

mathematical expression for first law of thermodynamics

∆E = q + w

When a system does work (w) on the surroundings, its internal energy decreases. In this case, work is taken as negative (-w).

Now, if 'q' is the amount of heat absorbed by the system and 'w' is the work done by the system, then change in internal energy becomes

∆E = q + (-w) = q - w

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