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19 August, 19:07

Work done by a system is positive or negative?

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  1. 19 August, 22:53
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    The internal energy has the symbol U. Q is positive if heat is added to the system, and negative if heat is removed;

    ... "W is positive if work is done by the system" ...

    and negative if work is done on the system.

    So, work done by a system is positive.
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