Chemistry / Chem 0070 · Atom · ~20 seconds
Extensive Property
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An extensive property is a property whose value depends on how much matter is present, in direct proportion to the amount.
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A long coil of copper wire has more mass than a short piece cut from the same coil, because mass is extensive.
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Doubling a sample always changes an extensive property's value, so it cannot alone identify what a substance is.