The boiling-point elevation, ATh, is found to be proportional to the molality, bB, of the solution (for dilute solution) △7=T-Tb=KbbB K: The constant of proportionality ty,(we called the boiling -point-elevation constant),it depends only on the solventThe boiling-point elevation, ΔTb , is found to be proportional to the molality, bB , of the solution (for dilute solution). ΔTb = Tb – Tb 0= Kb • bB Kb : The constant of proportionality, (we called the boiling-point-elevation constant), it depends only on the solvent