What is "molality"

molality \molality\ n. (Chem.) 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.

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

n. molal concentration

Molality, also called molal concentration, is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent. This contrasts with the definition of molarity which is based on a specified volume of solution.

A commonly used unit for molality in chemistry is mol/ kg. A solution of concentration 1 mol/kg is also sometimes denoted as 1 molal.