Why the salt water behaves in the sea


The person skilled in the art describes this behavior as the Density anomaly of the water.

For a long time it was a mystery to physicists. Today we know that the structure of the water molecule is responsible for this. It consists of one oxygen and two hydrogen atoms.

These are not arranged directly in a row, but they form an angle. Because of this and the arrangement of the electrons in the molecule, water behaves so differently than we know it from most substances.

Density anomaly of the water

Salt water - heavier than water


In the sea, it is easier to float on the surface of the water as a "dead man".

It's even child's play in the very salty Dead Sea. The reason is that salt increases the density of the water. Thus the buoyancy becomes stronger and we can drift more easily.

With the same load in the sea, ships are also less deep in the water than in a river.

Swimming in the Dead Sea © Mauritius

Salt that dissolves in the water finds a good place between the water molecules, so to speak, without taking up much space. This hardly increases the volume of the salt water, but the weight increases by that of the salt. Therefore, salt water has a higher density than fresh water.