What is air pressure? The measurement of the air's moisture.

The measurement of the air's moisture.

The pressure that air exerts as it is being pulled to Earth by gravity.
The pressure that air exerts as it is being pulled to Earth by gravity.

The speed of winds in a region.
The speed of winds in a region.

The temperature of the atmosphere.

The force exerted by the weight of the atmosphere above a given point on Earth's surface.