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The ideal gas law, also known as the general gas equation, is a mathematical formula that describes the relationship between the volume (V), temperature (T), pressure (P) and number of moles (or the amount in moles, n) of a gas. The ideal gas law is given by the equation PV = nRT, where R is the ideal gas constant, which is equal to 0.0821 L⋅atm/(mol⋅K).