describe the salinity of ocean water?
Answers
Salinity is the saltiness or dissolved inorganic salt content of a body of water. Substances that are dissolved in water are usually called solutes. The typical seawater has a salinity of 35 ppt or 35‰. The average density of seawater at the surface is 1.025g/ml.
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Explanation:
There are many chemicals in seawater that make it salty. Most of them get there from rivers carrying chemicals dissolved out of rock and soil. The main one is sodium chloride, often just called salt. Most seawater has about 35 g (7 teaspoons) of salt in every 1,000 g (about a litre) of water. This doesn’t sound very much, but it would take close to two 6 m shipping containers full of salt to make an Olympic-size swimming pool as salty as the sea.
The commonest way to record salinity is to measure the amount of salt in 1,000 g of water, so it is referred to as ‘parts per thousand’ or ppt. Most of the ocean has a salinity of between 34 ppt and 36 ppt.
Some properties of water are changed by having salt in it:
Salt makes seawater more dense than freshwater.
Salty water needs to be colder than freshwater before it freezes.
Variation in salinity
The salinity of the ocean varies from place to place, especially at the surface. Much of the ocean has salinity between 34 ppt and 36 ppt, but there are places that tend to be higher or lower.