what is pressure?????and its si unit????
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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.
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Pressure—the effect of a force applied to a surface—is a derived unit, obtained from combining base units. The unit of pressure in the SI system is the pascal (Pa), defined as a force of one Newton per square meter. The conversion between atm, Pa, and torr is as follows: 1 atm = 101325 Pa = 760 torr.
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