Chemistry / Unit 1 Chem 0070 short lesson, about 20 seconds
Extensive Property
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The idea
An extensive property is a property whose value depends on how much matter is present, in direct proportion to the amount.
In practice
A long coil of copper wire has more mass than a short piece cut from the same coil, because mass is extensive.
Where people slip
Doubling a sample always changes an extensive property's value, so it cannot alone identify what a substance is.
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