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When heat (q) is absorbed by a system, t...

When heat (q) is absorbed by a system, the sign of q is positive, and when it is rejected by a system, the sign of q is negative. Why?

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When work (w) is done by the system, the sign of w is negative. But when it is done on the system, the sign of w is positive, give reason.

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Knowledge Check

  • A system is said to be an isolated system when it is

    A
    incapable of exchanging energy with the surroundings
    B
    incapable of exchanging matter with the surroundings
    C
    incapable of exchanging both matter and energy with the surroundings
    D
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