Molar Concentration

In chemistry, the molar concentration, is defined as the amount of a constituent divided by the volume of the mixture :

It is also called molarity, amount-of-substance concentration, amount concentration, substance concentration, or simply concentration. The volume in the definition refers to the volume of the solution, not the volume of the solvent. One litre of a solution usually contains either slightly more or slightly less than 1 litre of solvent because the process of dissolution causes volume of liquid to increase or decrease.