In this equation mB is the molality of the solute.
The common or practical unit of concentration is the molality.
Molality is the reference concentration for most thermodynamic data.
To avoid ambiguity, the terms osmolal and osmolar can be used when the units of molality or molarity are consistent throughout the calculation.
A solution with a molality of 3 mol/kg is often described as 3 molal or 3 m.
