saturation vapour pressure

https://doi.org/10.1351/goldbook.S05479
The pressure exerted by a pure substance (at a given temperature) in a system containing only the vapour and condensed phase (liquid or solid) of the substance.
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2212 [Terms] [Paper]