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APPARATUS The construction of the calorimeter is shown in Figure 1. The calorimeter hody consists of five gold-plated hrass discs (A-E). The suhstance to he vaporized is applied to a glass fihre wick (F) lying in the cavity hetween discs B and C. The wick is kept in a spiral form hy means of a gold spiral (G). Through a gold tuhe (H) a slow stream of argon is forced over the wick. The heat loss accompanying the vaporization is compensated hy electrical energy generated in the heating element (1), which is a spiralized manganin wire, lacquered and nylon-spun (40 n resistance) lying in a spiral grove in disc D. An air gap hetween disc D and the hottom disc E prevents overheating of the hottom surface. Discs A and B are fastened to C hy means of four screws.

An adiabatic calorimeter for measuring heats of vaporization at 25 °C