Salinity

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Average salinity of the surface for the World Ocean per year.  Data from the World Ocean Atlas 2001.
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Average salinity of the surface for the World Ocean per year. Data from the World Ocean Atlas 2001.

Salinity is a scientific term. Scientists use it to tell how much salt there is in water. 1% salinity means that there are 10 grams of salt in one litre of water.

  • Fresh water contains less than 0.1% of salt. This is the usual case for rivers and lakes.
  • Brackish water contains between 0.1 % and 3 % of salt. This environment is usually found at estuaries where a river flows into the sea.
  • Saline water contains between 3% and 5% of salt (per volume). Usually, there is about 3.5 % salt in the water of the oceans.
  • Water that has more than 5 % salt in it, is called Brine. Some lakes and bodies of water have that much salt in them. The Dead Sea has about 15% salt on the surface.

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