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Phantastic Physics Demos: Blow 2 Cans Together

A great proof of Bernoulli's principle is to set two empty soda cans on a table.   Place them parallel to each other and a few centimeters apart.   When they are just sitting there, the air has the same slow speed on all sides of the cans.   This means the force from the slow air is equal in all directions.  Now put your face down near the table and blow across the table between the two cans.  By blowing between the cans, you are making the air between the cans move faster than the air on the other side of the cans.  The movie below shows this happening...

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