A method of measuring the oxygen partial pressure in an atmosphere in which a temperature T.sub.c at which the free energy of formation of an oxide of a metal such as palladium in contact with the atmosphere is determined to provide a measure of the partial pressure of oxygen. Apparatus for use in the...http://www.google.com/patents/US4548680?utm_source=gb-gplus-sharePatent US4548680 - Method for determining the partial pressure of oxygen in an atmosphere
