Monday, August 16, 2010

Air Pressure and Bernoulli: Cardboard Tubes

Place two cardboard tubes (make sure they're nice and round) on a table, an inch or two apart from each other.

Use a straw to blow through the gap between the tubes.

The tubes roll together! You pushed the air molecules from the middle out of the way, allowing the air on the other side of the tubes to push them toward the middle.

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