Excess pressure required to maintain osmotic equilibrium between a solution and the pure solvent separated by a
membrane permeable only to the solvent;
where
is the
gas constant,
the
thermodynamic temperature and
the
amount concentration of individually moving solute molecules, different ions etc. regardless of their nature.
Source:
See also:
PAC, 1996, 68, 957
(Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996))
on page 985
