Abstract
The logarithms of the partial pressures of the components of the gaseous phase are plotted against the logarithm of the partial pressureof the oxygen under conditions of constant temperature, constant total pressure, and constant ratios of all elements except oxygen. The result is a quantitative survey of the effect of oxidation on the gases present. The equilibrium composition of an individual volcanic gas sample or of any mixture of gases may be obtained from the diagram when the atomic ratio of the oxygen is also fixed. In constructing logarithmic partial pressure diagrams, it is essential to know which molecular species may become dominant (contain virtually all of a certain element) under the conditions of the diagram.
Published Version
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