4cb44e77_Mashpedia___Water__Remarks
[Property] Density: mass per unit volume [Importance to the environment] Controls oceanic vertical circulation, aids in heat distribution, and allows seasonal stratification [Remarks] 
Density is determined by (1) temperature, (2) salinity, and (3) pressure, in that order of importance. The temperature of maximum density for pure water is 4 °C. For seawater, the freezing point decreases with increasing salinity
Mashpedia - Water