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Learners observe and compare the sizes of three toy “growing” crocodiles made from water-absorbent polymers. One is it its original state, dry, hard, and about 10cm long.

Learners mix liquid water with solid cornstarch. They investigate the slime produced, which has properties of both a solid and a liquid.

Learners observe a sealed test tube containing a small amount of solid stearic acid.

This is written as a display, but can easily be adapted to a hands-on activity. Learners observe and shake containers of shiny liquids.