Question

what is mean by pressure

Answer 1

continuous physical force exerted on or against an object by something in contact with it.

or

according to physics..

pressure is the force acting per unit area.....


and its S.I unit is Pascal
....

Answer 2

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure is the pressure relative to the ambient pressure. Various units are used to express pressure.

I think it will help you
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