| http://www.w3.org/ns/prov#value | - The gas mixture may include an oxygen-containing gas, such as O2, O3, water vapor (H2O), a hydrogen-containing gas, such as H2, forming gas, water vapor (H2O), alkanes, alkenes, and the like, or an inert gas, such as a nitrogen gas (N2), argon (Ar), helium (He), and the like.
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