Question

Raghav placed a small coin on a table about 1cm from the edge. He then bent down so that his mouth was level with the tabletop, and blew hard across the top of the coin. He found the coin jumping. Why do you think this happened? (Try it yourself.)

Answer 1

When Raghav blew hard across the top of the coin, he found the coin jumping because the air blown out has high speed and thus low pressure; so, air on the surface of the coin has high pressure. Also, air moves from area of high pressure to low pressure. This air movement caused the coin to jump.