| http://www.w3.org/ns/prov#value | - The atmosphere in which the partial pressure of oxygen gas is 1 Pa or less refers to a vacuum, an inert gas atmosphere such as nitrogen or argon, or a reducing gas atmosphere such as hydrogen gas, etc., and the atmosphere is preferably an inert gas atmosphere in which the partial pressure of oxygen gas is 1 Pa or less and is more preferably a nitrogen gas atmosphere in which the partial pressure o
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