The quantity the is help constant in Boyles's law is Temperature, Charles' law is Pressure, Gay-Lussac's law is number of moles.
Boyle's law states that at constant temperature the volume of the gas is directly proportional to the pressure exerted by the gas.
P α V....(i)
Charles' law states that at constant pressure the volume of the gas is directly proportional to the absolute temperature of the gas.
V α T....(ii)
Gay-Lussac's law states that for a given number of molecules of gas the Pressure of the gas is directly proportional to the absolute Temperature of the gas.
P α T....(iii)
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