| Definition: | air or inert gas used for maintaining an overpressure and, if required, dilution and purging Note 1 to entry: "Inert gas" means nitrogen, carbon dioxide, argon, or any gas which, when mixed with oxygen in the ratio 4 parts inert to 1 part oxygen as found in air, does not negatively affect the ignition and flammability properties (such as flammable limits).
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