The molal elevation constant is the ratio of elevation in boiling point to molality of solution. ΔTb=Kb×m Kb=
ΔTb
m
Here, Kb= molal elevation constant ΔTb= increase in boiling point m= molality of solution Due to solute presence in solution, the solution's boiling point is greater than the pure solvent's boiling point. This is called elevation in boiling point (ΔTp).