The determination of latent heats of vaporization under quasi-isothermal conditions

A method was devised to evaluate latent heats of vaporization from quasi-is othermal isobaric analysis data. The procedure requires the recording of at least two diagrams: one for the investigated liquid, and the other for a s tandard liquid with a known latent heat of vaporization. Use of the method to determine the heats of vaporization of some alcohols, with water as stan dard liquid, led to results close to those previously reported in the liter ature. The main advantage of the procedure consists in the fact that it requires o nly small amounts of sample (5-10 mg).