Furnace atmosphere which gives off oxygen under certain conditions or where there is an excess of oxygen in the product of combustion, or the products of combustion are oxidizing to the metal being heated.
An atmosphere resulting from the combustion of fuels in an atmosphere where excess oxygen is present, and with no unburned fuel lost in the products of combustion.
Gaseous environment in which an element or ion changes from a lower to a higher positive oxidation state (i.e., removes one or more electrons from an atom, ion, or molecule).