Question

what are the sign conventions used for q and z? ​

Answer 1

Heat absorbed by the system = q+ (positive)

Heat evolved by the system = q− (negative)

Work done on the system = w+ (positive)

Work done by the system = w− (negative)

Hope it helps you ✌

Answer 2

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Heat absorbed by the system = q+ (positive) Heat evolved by the system = q− (negative) Work done on the system = w+ (positive) Work done by the system = w− (negative)