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An explanation of why mass does not change during a physical change. The examples used are melting and boiling. Animations are used to show that atoms and molecules are not made or destroyed.
This clip is from:
First broadcast:
25 March 2003

Classroom Ideas

Students could use this clip to conduct an experiment where they measure the mass of substances before and after a physical change, for example, melting and dissolving. Students could then storyboard their own clip or presentation to explain why mass doesn't change in dissolving.