Like solid bodies, fluids also put pressure on others because of their weight.
To obtain this pressure, consider a vessel containing a density liquid. d that occupies the container up to a height H, in a place on the planet where the acceleration of gravity is g.
The force exerted on the contact area is the weight of the liquid.
The mass of the liquid is:
but , soon:
That is, the hydrostatic pressure does not depend on the shape of the container, only the fluid density, the height of the point where the pressure is exerted and the acceleration of gravity.
Atmosphere is a layer of gases that surrounds the entire surface of the earth.
Approximately all the air present on Earth is below 18000 meters altitude. Because air is made up of molecules that have mass, air also has pasta and consequently Weight.
The pressure that the weight of air exerts on the earth's surface is called Atmospheric pressure, and its value depends on the altitude of the place where it is measured.
The higher the altitude, the lower the atmospheric pressure and vice versa.