Changing the volume available for "molecules" has an effect on how often the molecules hit the walls of their container.
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Hi-speed film shows how drops behave on a hot surface.
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Infrared photography allows us to see a chemical reaction pull heat from its environment.
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As the air is pumped out of the test tube and the pressure decreases, the water starts to boil.
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See hot and cold water mix in infrared.
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