Ideal [[Gas|gases]] are formed at [[Pressure|pressures]] far below the [[Substance|substance]] critical pressure and at high [[Temperature|temperatures]], over twice as high as the substance critical temperature. The ideal gas law relates the pressure, temperature, [[Mass|mass]], and [[Volume|volume]] of a substance with a constant, the [[Universal Gas Constant|universal gas constant]], $\bar{R}=8.3145$ J$\cdot$mol$^{-1}\cdot$K$^{-1}$. $PV=n\bar{R}T$ The universal gas constant can be normalized using the [[Mole|molar mass]], $M$ of a substance, as such each substance has a unique ideal gas constant, $R=\dfrac{\bar{R}}{M}$​. The ideal gas law can therefore also be written for a specific substance: $P\nu=RT$ $PV=mRT$