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Combined gas law

Combining the laws of Charles, Boyle and Gay-Lussac gives the combined gas law, which takes the same functional form as the ideal gas law says that the number of moles is unspecified, and the ratio of P V {\displaystyle PV} to T {\displaystyle T} is simply taken as a constant:

where P {\displaystyle P} is the pressure of the gas, V {\displaystyle V} is the volume of the gas, T {\displaystyle T} is the absolute temperature of the gas, and k {\displaystyle k} is a constant. When comparing the same substance under two different sets of conditions, the law can be written as