monsoon), seawater can be substantially less saline. Where mixing occurs with freshwater runoff from river mouths, near melting glaciers or vast amounts of precipitation (e.g. Data from the World Ocean Atlas Īlthough the vast majority of seawater has a salinity of between 31 and 38 g/kg, that is 3.1–3.8%, seawater is not uniformly saline throughout the world. Properties Salinity įurther information: Salinity § Seawater, and Ocean § Salinity Annual mean sea surface salinity expressed in the Practical Salinity Scale for the World Ocean. However, there is no universally accepted reference pH-scale for seawater and the difference between measurements based on different reference scales may be up to 0.14 units. Seawater pH is typically limited to a range between 7.5 and 8.4. The coldest seawater still in the liquid state ever recorded was found in 2010, in a stream under an Antarctic glacier: the measured temperature was −2.6 ☌ (27.3 ☏). At typical salinity, it freezes at about −2 ☌ (28 ☏). The freezing point of seawater decreases as salt concentration increases. Seawater is denser than both fresh water and pure water (density 1.0 kg/L at 4 ☌ (39 ☏)) because the dissolved salts increase the mass by a larger proportion than the volume. The average density at the surface is 1.025 kg/L. This means that every kilogram (roughly one liter by volume) of seawater has approximately 35 grams (1.2 oz) of dissolved salts (predominantly sodium ( Na + On average, seawater in the world's oceans has a salinity of about 3.5% (35 g/L, 35 ppt, 600 mM). Seawater, or sea water, is water from a sea or ocean.
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