Heat Capacity Curves of the Simpler Gases. III. Heat Capacity, Entropy and Free Energy of Neutral OH from Near Zero Absolute to 5000°K.

Abstract

The decomposition pressure of the anhydrous normal sulfate reaches one atmosphere at about 810°.3. Ph measurements of indium sulfate solutions show that a considerable degree of hydrolysis occurs.

A Mollier Diagram for the Internal-combustion Engine.

“…Care must be exercised if the piston goes through top dead center in one of the steps. However, equation 4 or equation 5, with the work correction, is not sufficient in this case because the pressure-volume relation is not known in 6 These results on flame propagation replace those given in figure 7 of reference 3, which were obtained by a method there labelled an approximation. advance, and hence the work term is not fixed by the technique of choosing pc.…”

“…In recent years the technique of calculating the specific heats of gases over a temperature range extending down to absolute zero has been perfected; the calculations have been carried out for a number of gases, and the results have been published in a series of papers by Johnston and his coworkers (1,4,5,6,7,8), and in papers by Kassel (9) and Gordon (2), all of which appeared in the years 1933, 1934, and 1935. Knowledge of the specific heats permits the calculation of entropies; the results of these calculations are given in the papers mentioned.…”

“…7. Change of pressure with progress of combustion for three conditions of firing obtainable from figure 6 by averaging along the p"-curve over the pressure interval within which the corresponding increment burned.…”

The specific heat of gases at high temperatures

“…It is, therefore, of great interest to compare these "spectroscopic values" with those obtained in the present investigation and, as this has been done, it is necessary to give the source of the spectroscopic values that have been used. During the last few years Giauque (1930 a, b;Gia uque and Overstreet 1932;Clayton and Giauque 1932), Johnston and their co-workers Chapman 1933; Walker 1933 a, b, 1935; Lewis and von Elbe 1933 a, b;Johnston and Dawson 1933;Giauque and Clayton 1933;Gordon 1934;Johnston and Davis 1934;D avis and Johnston 1934;Kassel 1934) have published their spectroscopic determinations of the molecular heat at constant pressure of such gases as hydrogen (Davis and Johnston 1934), carbon monoxide (Johnston and Davis 1934), nitrogen (Johnston and Davis 1934), oxygen (Johnston and Walker 1935), nitric oxide (Johnston and Chapman 1933 ), OH (Johnston and Dawson 1933), carbon dioxide (Kassel 1934), nitrous oxide (Kassel 1934) and water vapour (Gordon 1934), the temperatures extending in many cases up to 5000° C (abs. ).…”