Pressure

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From a physical point of view, pressure is the relationship between a force acting on a surface and the area of the surface itself.

The atmospheric pressure of a planet is, at a certain level, the weight exerted on the surface unit of the gas column that is above the surface itself.

Pressure is usually measured in atmospheres (atm); In the International System of Units (SI), the pressure is expressed in Newtons per square meter; One Newton per square meter is a pascal (Pa). The atmosphere is defined as 101,325 Pa, and is equivalent to 760 mm of mercury in a conventional barometer.