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An explanation of how an ice cube melts in a glass of water, how solid carbon dioxide or dry ice sublimates to give a smoke effect at discos, and how sweat evaporates by taking heat energy from the skin. Animations are used to show the arrangements of particles as the changes of state occur.
This clip is from:
First broadcast:
28 February 2008

Classroom Ideas

Students could make a simple particle model using building blocks, and recreate the three examples from the clip, explaining where the energy is.