what variable is mentioned in the ideal gas law that is assumed to be constant in the other gas laws?



The quantity that is variable in an ideal gas law PV=nrt  but assumed to be constant in boyles law, Charles law and pressure law is the number of moles, n.
 In all the gas law , pressure of the gas, volume and temperature are all  varies. But the statement “ the fixed mass of a gas” made in three law ( boyles, Charles  and pressure law) , the term fixed mass refer to the number of moles, as we can relate the mass of a gas to the number of mole , n, as follows.  N= mass of gas /molar mass or  number of mole = (mass of gas )/( atomic mass of the gas).

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