define pressure and its SI unit
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Pressure is the amount of force applied perpendicular to the surface of an object per unit area and the for it is p (or P). The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m2, or kg·m−1·s−2).
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Pressure is the quantity which can be measured using various units like atm . But in SI unit the pressure is measured by Pascal (pa). one Pascal is equal to the pressure exerted by the force of a magnitude one Newton perpendicularly upon an area of one square metre.
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