Ten analytical models were used to calculate the enthalpy of vaporization of fluids at the boiling temperature. The correlations considered were six specific expressions valid only at that temperature, and four general correlations valid for any temperature. Most of these models require as inputs the critical properties and the acentric factor, but one of the specific models requires only the molecular weight (and, obviously, the boiling temperature). One of the models is a correlation requiring a molecular Lennard-Jones parameter and the acentric factor as inputs. Results for 290 fluids are compared with the values given by the DIPPR project. (c) 2005 Elsevier B.V. All rights reserved.