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What form of matter is vapor?

a solid made of a substance that is usually liquid
a liquid made of a substance that is usually gas
a gas made of a substance that is usually solid
a gas made of a substance that is usually liquid

User Robertsan
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The form of matter that is vapor is a gas made of a substance that is usually liquid.
Vapor is created when water, or some other liquid evaporates - meaning that it becomes so hot in a room, or wherever, that the liquid starts becoming gas.
User Dan Kruchinin
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