Question

Sign convention when work is done by system

Answer 1

Answer:

A sign convention is required for heat and work energy transfers, and the classical sign convention is selected for these notes. According to the classical sign convention, heat transfer to a system and work done by a system are positive; heat transfer from a system and work done on a system are negative.

Explanation:

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Answer 2

When work is done by the system volume increases

so work done is positive

and work done on the system is negative

But in chemistry it's completely different

Work done on system is positive and work done by the system is negative