What is called pressure? In what units is pressure measured? Give examples of non-SI units of pressure.

Pressure is the ratio of the modulus F of the pressure force acting on the surface to the area S of this surface: p = F / S
In SI, the unit of pressure is pascal; 1 Pa = 1 N / m2
Pressure is also measured in atmospheres: 1 atm. = 101325 Pa

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