Molality abbreviated mol/kg or m, specifies the number of moles of solute per kilogram of solvent. The primary advantage of using molality to specify concentration is that unlike its volume, the mass of the solvent does not change with changes of temperature or pressure. So molality remains constant under changing environmental conditions.
Molality is another way of expressing the concentration of a solution. It can be defined as the number of moles of a solute dissolved in 1 kilogram of the solvent. The symbol for molality is m (small m in italics) or –m (small m with a hyphen). This is to differentiate molality from molarity which is designated by capital letter M; and to different it from mass, which is symbolized with small letter m.
"Molality is defined as the number of moles of solute dissolved in 1kg (1000g) of solvent."Molality Formula
is given by