Galileo's air thermometer forces liquid down when heated.

4E10.11 • C+75+15

diagram for demo

Galileo's air thermometer forces liquid down when heated. Heat the bulb with a hair dryer set on 'hot', or cool the bulb with the hair dryer set on 'cool' to show the change in the height of liquid in the column. Alternatives: Use the heat of a hand, or a cloth dipped in ice water.

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