Steady-state gas dissolution flow microcalorimeter for determination of heats of solution of slightly soluble gases in water

Publisher Website
Google Scholar
Abstract
A flow calorimeter of the heat conduction type is described, which is capable of measuring the heat effect associated with the process of dissolving slightly soluble gases into water. The calorimeter operates in a steady‐state mode. Gas, fed at constant rate, is dissolved in flowing water within a specially designed microcalorimeter cell and the power is determined for the process. Computer control of the gas flow is used for convenient establishment of steady states. The calorimeter is calibrated electrically with a precision of 0.2% for power levels of 150–450 μW. Reproducibility of successive measurements of heats of solution of oxygen are within 1%. Results are presented for the enthalpy change for the dissolution of oxygen gas into pure water at 25 °C.