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.
Green Book, 2nd ed., p. 12 [Terms] [Book]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 987 [Terms] [Paper]