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- a substance changes from a liquid to a gas by heating it to its boiling point (i.e water in a kettle turning to water vapor)
- a substance changes from a liquid to a gas (or vapor) naturally (ie. when a puddle dries by the water in it evaporating)
- a substance changes from a gas (or vapor) into a liquid (ie. water vapor condenses to tiny droplets of water on a cold window)