what is pressure???
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Pressure (P) is defined as the force per unit area applied in a direction perpendicular to the plane surface of an object. Mathematically it is P = F/A, where F = Force and A = Area. Then, atmospheric pressure is the total weight of the air above the unit area at the point where the pressure is measured.
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continuous physical force exerted on or against an object by something in contact with it.
"the gate was buckling under the pressure of the crowd outside"
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the use of persuasion or intimidation to make someone do something.
"backbenchers put pressure on the government to provide safeguards
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