We define the specific ideal gas constant rgas for a particular gas as the ratio of the universal gas constant and the molar mass (also called molecular weight) of the gas, rgas = rum . for a particular gas, then, the ideal gas law is written as follows: pv = mrgast or p = rhorgast, where p is the pressure, v is the volume, m is the mass, t is the absolute temperature, and rho is the density of the particular gas. identify the primary dimensions of rgas. for air, rair = 287.0 j/kg·k in standard si units. verify that these units agree with your result.