Question

What is air pressure?

Answer 1

Air Pressure

1. Air exerts pressure in all directions. The pressure exerted by air is called the air pressure, which is the thrust exerted by air per unit area. The weight of the air acting on a unit surface area is called the atmospheric pressure.
2. Air pressure is measured by Barometer.

To show that air exerts pressure, take a glass and fill it with water. Cover the mouth of the glass with an index card. Now hold the card in place and invert the glass over a sink and remove your hand from the card. The card sticks to the glass. This is because air exerts pressure on the card from below to keep the card in place. Here the pressure exerted by air upwards is more than the pressure exerted by water downwards.