Preferred Label : condensation nuclei;
Detailed label : condensation nuclei (CN) in atmospheric chemistry;
IUPAC acronym : CCN; CN;
IUPAC definition : Particles, either liquid or solid, or ions upon which condensation of water vapour
(or other substances) begins in the atmosphere. Condensation nuclei are usually very
small hygroscopic aerosols (0.001 µm to 0.1 µm in diameter), but these are not as
abundant as the smaller particles. The number of CN which are active (initiate condensation)
in a given air mass may be a function of the relative humidity. Usually CN are counted
as the active nuclei at about 300% relative humidity, while cloud condensation nuclei
(CCN) are counted as the number of active nuclei at relative humidity less than or
equal to 102%.;
Origin ID : C01236;
Automatic exact mappings (from CISMeF team)
- See also
Particles, either liquid or solid, or ions upon which condensation of water vapour
(or other substances) begins in the atmosphere. Condensation nuclei are usually very
small hygroscopic aerosols (0.001 µm to 0.1 µm in diameter), but these are not as
abundant as the smaller particles. The number of CN which are active (initiate condensation)
in a given air mass may be a function of the relative humidity. Usually CN are counted
as the active nuclei at about 300% relative humidity, while cloud condensation nuclei
(CCN) are counted as the number of active nuclei at relative humidity less than or
equal to 102%.
