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Vapor pressure is the focus of this chemistry video. Sal explains that, when molecules are "sticking together" a substance takes on a liquid, or a solid form. But when kinetic energy is increased, the molecules are forced apart and a substance can take on a gaseous state. He goes on to illustrate (using chemistry concepts), why different substances have different boiling points, or points where a gaseous state is achieved.
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BY-NC-SA: 3.0
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