L = latent heat [J/kg]

L = [2.5004 - 0.002363 * (T - 273.15)] ·10⁶  for T > 273.16 K

L = 55.508435 * [56579 - 42.212 T + exp{0.1149(281.6 - T)}]   for under-cooled water in range 236 K < T < 273.16 K
(after D.M. Murphy and T. Koop, Q. J. R. Meteorol. Soc., 2005)

T = temperature [K]

T from K to K

Latent heat calculation

T: K     

L: MJ/kg