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Ideal gas equation of state (mass form) [latex]Pv=RT[/latex]  and  [latex]P\mathbb{V}=mRT[/latex]
where  [latex]m:[/latex] mass,   [latex]R:[/latex] gas constant,   [latex]\mathbb{V}:[/latex] volume,   [latex]v:[/latex] specific volume,   [latex]T:[/latex] temperature in Kelvin
Compressibility factor [latex]{Z}={Pv}/{RT}[/latex]