When the pressure of the vapour of an element in equilibrium with the liquid is 1 atmosphere, the liquid element boils. Complete conversion into vapour, requires the absorption of the the enthalpy of vaporization, %Delta;Hvap.
Notes
None
Literature sources
G.W.C. Kaye and T.H. Laby in Tables of physical and chemical constants, Longman, London, UK, 15th edition, 1993.