Abstract
Gas analysis in metals is generally taken to mean the analysis of metals for oxygen, nitrogen, and hydrogen (and sometimes carbon). These elements are often measured as gases in the final analysis but are rarely present in the metal in the gaseous form, except in the case of bubbles trapped during solidification. In some recent physical techniques, such as radio activation analysis of oxygen in metals, the oxygen is not converted into the gaseous form even for measurement. In this case the only justification for using the term “gas analysis” is that the elements themselves are gases and under this definition the analysis of carbon in metals is excluded from the present review.
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