When there are a lot of molecules in one place it is considered an area of:

When there are a lot of molecules in one place it is considered an area of high concentration. Details about concentration can be found below.
Concentration can be described as the amount of solute in a solution measured in suitable units.
The concentration of a solution is dependent on the amount of solute molecules in that solution.
A solution is said to have a high concentration if it has more solute molecules while a low concentration has less solute molecules.
Therefore, when there are a lot of molecules in one place it is considered an area of high concentration.
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