Microcalorimetric investigations: Part I. Construction of a microcalorimeter for heats of combustion. Part II. Heats and entropies of ionization of some anilines.

Abstract

A microcalorimeter of the Tian-Calvet type has been constructed for the purpose of measuring heats of combustion. The instrument consists of a differentially-connected system of two iron-constantan thermopiles, each being constructed of sixteen thermocouples. The recording of the heat liberated is accomplished by means of a d.c. amplifier; the areas thus recorded are integrated by an electronic integrator. The apparatus is capable of measuring heats of the order of 10-3cal. The microcalorimeter is discussed from the theoretical and practical points of view.