Dr. Tatiana Erukhimova demonstrates how atmospheric pressure can break a ruler with physics. When spreading out the newspaper on top of the ruler, Dr. Tatiana basically creates a large suction cup by preventing air from flowing underneath. When she strikes the ruler, it tries to lift up against the newspaper, but because the air can’t flow fast enough into the space between the table and the newspaper, most of it pushes down on the newspaper (and the ruler). All that weight on the ruler causes it to snap.

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