Molarity vs. Molality — What's the Difference?

Abbr. M The concentration of a solution expressed in moles of solute per liter of solution.

Molality is a measure of the number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent. This contrasts with the definition of molarity which is based on a specified volume of solution.

(chemistry) the concentration of a substance in solution, expressed as the number of moles of solute per litre of solution

Abbr. m The concentration of a solution expressed in moles of solute per kilogram of solvent. Also called molal.

Concentration measured by the number of moles of solute per liter of solvent

(chemistry) the concentration of a substance in solution, expressed as the number of moles of solute per kilogram of solvent

A measure of concentaration of substances in mixtures, 1 molal being the concentration of a solution containing 1 mole of solute per 1000 grams of solvent. Compare molar.

Molal concentration