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In this activity, learners work in pairs to measure each other's ankles with lengths of string.

The demonstration/experiment provides quick proof that air has mass.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

In this quick activity, learners drink Avogadro's number worth of molecules - 6.02x10^23 molecules!

Learners measure a bottle full of air, and then use a vacuum pump to remove the air. When they re-weigh the bottle, learners find the mass is about 0.8g less.