Salinity - Marine Ecosystems
Physico-chemical factors - Salinity
The sea is salty and its salinity is fairly constant, averaging about 3.5 per cent usually written as 35 (parts per thousand). Sodium chloride is the main salt being 27 per cent while the rest are calcium, potassium and magnesium salts. Odum (1971) gives the following percentage of thousands/kg as shown in Table T.
Table: Chemistry of the Sea Water