If you have or want to order the dipping bird demonstration, it is useful for showing how evaporation and changes in the pressure of a closed system cause cyclical motion. After teaching about pressure, consider setting this little guy up and asking your class to try explaining how it works. You could also hold the bird's abdomen, warming it with your hand to increase pressure and drive fluid into the head.

Concepts

density, evaporation, pressure

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Additional Tags

evaporation, pressure, density, science

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Pros

• Can be used to stimulate critical thinking

Cons

• None