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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.
(in physics) the law stating that the product of the volume and pressure of a gas contained at a constant temperature remains constant. at a constant temperature and mass the volume of a perfect gas varies inversely with pressure; that is, as increasing pressure is applied, the volume decreases.