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The ideal gas law,pv=nRT, gives an accurate description of the behavior of real gases at low pressures and at temperatures which are high relative to the boiling point. The volume occupied by one mole of a gas is its molar volume, . For an ideal gas V=RT/P. This gives a value of 22.414 L at STP ('Standard temperature and pressure' of 273.15 K and 1atm). In industry  and commerce ,STP are often necessary to define the Standard reference conditions to express the related quantities such as the rate of volumetric flow.