Rolling Down One Car Window vs Two

If you’re driving a car and you roll down your window, a low frequency will be produced due to the air flowing in, out and past your open window. Technically this is the Helmholtz Resonance, the same principle that makes a bottle hum when you blow over its open top.

Interesting: If you also roll down the passenger side window, the frequency will cut in half.

Can you hear the difference?

Drive safely!

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