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Twirl this 30-inch plastic "hose" over your head at different speeds and make at least five different tones, depending on how fast you can twirl! This is a fun science activity that's also guaranteed to get your arm in shape!

What's included?

• Your choice of 1 or 3 Sound Hoses in assorted colors

How does it work?

Twirl the tube above your head and the air molecules drifting inside are in for a ride! They begin to bump against each other and vibrate, creating sound waves that you can hear. The faster you move the Sound Hose, the higher the pitch. Experiment with different speeds to pick up the whistle.

What does it teach?

Learn about Bernoulli's Principle, and how fast moving air molecules create lower pressure. In this experiment, the free end of the hose is moving faster than your hand, so the higher pressure (where you hold the hose) sucks up the air from the free end (lower whistle) and makes the whistle.

Experiment

Stand outside your classroom door and start twirling as fast as you can. Don't stop! Everyone inside will be amazed at your capacity to whistle!