This is a unit of concentration, specifically mass concentration, that measures the amount of a substance (in grams) present in a liter of solution.
Mass Concentration: This refers to the mass of a solute (substance being dissolved) divided by the volume of the solution it's in.
This is defined as mass per unit volume. It can also be used as a measure of concentration when dealing with solids or liquids.
This term describes how much solute can dissolve in a specific solvent at a given temperature.