A controlled test in which a taper is exposed to a specified gas mixture to determine whether its candle flame persists under a fixed protocol. The result depends on composition, flow, time, taper and thermal conditions; it is not a general test of whether the gas can safely be breathed.
A condition-dependent carbon dioxide fraction at which a specified candle flame is extinguished in a specified protocol. Distinguish a demonstrated sufficient fraction from the least sufficient fraction.
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