David discovers the omnipresence and properties of air while contemplating a feather that floated to the ground. He learns ...

1618: Issac Beekman compares air to water, and the pressure water exerts at depth, and comes up with the then radical suggestion that air has physical properties. Even Galileo and Descartes ...

The atmosphere exerts pressure on all objects in it. When a vibrating body moves in air, it creates slight disturbances of the AMBIENT atmospheric pressure. The AMPLITUDE of these pressure variations ...