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Pressure is defined as force per unit area. It is usually more convenient to use pressure rather than force to describe the influences upon fluid behavior. The standard unit for pressure is the Pascal, which is a Newton per square meter.
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Pressure in a fluid can be seen to be a measure of energy per unit volume
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Atmospheric pressure is defined as the force per unit area exerted against a surface by the weight of the air above that surface.
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the force applied to a unit area of surface; measured in pascals
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Pressure is an expression of force exerted on a surface per unit area. The standard unit of pressure is the pascal (Pa), equivalent to one newton per meter squared
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