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The SI unit of pressure is the kilogram per metre-second squared, which is called the pascal (1 Pa = 1 kg/m s2). Since pressure is force per unit area, one pascal (Pa) is one newton per square metre. An alternative way of thinking of the pascal is as one joule/m3 which is helpful in compression work. Conversion between other units of pressure and the pascal are:
1 mmHg (0oC) = 133.322... Pa. The millimeter of mercury, mmHg, is almost the same as the exactly defined torr; 1 torr = (101325/760) Pa (exactly)
1 inch Hg (0oC) = 3386.39... Pa 1 bar = 100000 Pa (exactly)