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The Ideal Gas Law is one of the Equations of State. Although the law describes the behavior of an ideal gas, the equation is applicable to real gases under many conditions, so it is a useful equation to learn to use. The Ideal Gas Law may be expressed as: PV = NkT.
The Universal Gas Constant-Ru-appears in the ideal gas law and can be expressed as the product between the Individual Gas Constant-R - for the particular gas-and the Molecular Weight-Mgas-for the gas, and is the same for all ideal or perfect gases : Ru = Mgas R (1). where. Ru = universal gas constant.