Question

content and Theroy of atmospheric pressure​

Answer 1

Content of Atmospheric pressure:

It is the force per unit area exerted against a surface by the weight of the air above that surface.

 p=F/A

Theory of Atmospheric pressure:

Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of the Earth.

In most circumstances, atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. As elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation.

Atmospheric pressure is caused by different factors :

• The gravitational attraction of the planet on the atmospheric gases above the surface and is a function of the mass of the planet, the radius of the surface, and the amount and composition of the gases, and their vertical distribution in the atmosphere

• It is modified by the planetary rotation and local effects such as wind velocity, density variations due to temperature, and variations in composition.    

thus, this is the required content and theory of atmospheric pressure.