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1.Pa pascal：International unit of pressure, 1Pa = 1N/m2.
2.Torr torr：Unit of pressure, 1 Torr = 1/760 atm.China PVD Coating Systems suppliers
atm standard atmosphere：Unit of pressure, 1atm=101325Pa。
3.mbar millibar：Unit of pressure, 1mbar=102Pa。
4.partial pressure：Pressure of a component in a mixture of gases.
5.total pressure：The sum of the pressures of all components in the mixture.
6.vacuum：The state of a gas below ambient atmospheric pressure in a specified space.
7.degree of vacuum：The degree of rarefaction of gases in vacuum is usually expressed by the pressure value.
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