https://doi.org/10.1351/goldbook.P04819
Normal force acting on a surface divided by the area of that surface. For a mixture of gases the contribution by each @C01281@ is called the @P04420@ \(p_{i}=x_{i}\ p\), where \(x_{i}\) is the @A00296@ of the \(i\)th @C01281@ and \(p\) is the total pressure.