molality

from WordNet (r) 3.0 (2006)

molality
    n 1: concentration measured by the number of moles of solute per
         kilogram of solvent [syn: {molality}, {molal
         concentration}]

from The Collaborative International Dictionary of English v.0.48

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}.
   [WordNet 1.5]