Question

Answer the following briefly, what is air pressure?

Answer 1

The air around each and every body has weight and that weight is exerted on the body around which it is, thus pressure is created around the object. Atmospheric pressure is one kind of air pressure, but every air pressure cannot be called atmospheric pressure.

Complete answer: The definition of air pressure goes as follows, the force exerted by the weight of air on the surface that the air surrounds is known as air pressure.
Even the tiniest atoms have some weight and due to that weight, force is applied to the near surface. Thus, a varying amount of air has varying pressure exerted on any surface.
Atmospheric pressure is the specific pressure exerted by the atmosphere on earth’s surface. It is also air pressure, but it is standardized for easier understanding of pressure.
Let us see some examples of air pressure, the pressure exerted by the air inside any closed container is the air pressure of that container.
If the container is open, the pressure inside the container will be the same as that of outside the container, thus the pressure inside the container is atmospheric pressure.
Thus, atmospheric pressure is just another example of air pressure.
Air pressure depends on various factors, such as volume and temperature. Let us assume that there is a container filled with air.
As volume of any container is increased without change in its temperature, the air pressure inside the container will decrease, and vice-versa. As the temperature of the container is increased without change in its volume, the air pressure inside the container will increase, and vice-versa.

Note:
The dependency of air pressure with temperature and volume is given by this formula $PV=nRT$ , where V is volume, P is pressure, T is temperature, R is universal gas constant and n is number of moles.