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In thermodynamics, intensive quantities do not depend on the size of the system. For example temperature and density are size-independent, intensive quantities.

Extensive quantities, on the other hand, are proportional to the size of the system: volume is an obvious one, internal energy and entropy are others.

A quick mental test is this: if I were to double the system's size by joining it to a duplicate of itself, would the relevant quantity remain the same or double? If it stays the same it is intensive, otherwise it is extensive.

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13y ago

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