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Evaporation and Condensation
Clip 1621 explains what happens to the molecules when a solid becomes a liquid and then a gas. See also 1857.
Clip 11070: Water Cycle
Making a rocket with fizzy tablet and water.
Experiment to see if an ice cube melts faster on a plastic plate or a metal pan.
Video on melting, evaporation, condensation and freezing-introducing molecules