"Exploring Size - Moving Molecules" is a hands-on activity in which visitors use an air cannon toy to spin pinwheels. They learn that air is made up of molecules, which are tiny nanometer-sized particles.
- A nanometer is a billionth of a meter.
- Air is made of molecules, which are tiny nanometer-sized particles.
- Nanometer-sized things are very small, and often behave differently than larger things do.
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