the mass density of water (also known as osmotic concentration).

In simpler terms, osmolality is an expression of solute osmotic concentration per mass of solvent, whereas osmolarity is per volume of solution (thus the conversion by multiplying with the mass density of solvent in solution (kg solvent/litre solution).

where is the molality of component .

Plasma osmolarity/osmolality is important for keeping proper electrolytic balance in the blood stream. Normally, sodium is the major contributor to plasma (or serum) osmolality;

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