An exothermic chemical reaction between a fuel and an oxidizing agent. Oxygen is a common oxidizer, but neither visible flame nor oxygen is required by every broader chemical use of the term.
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.
A material used as a source of released chemical energy, commonly by reaction with an oxidizing agent during combustion.
A diffusion flame sustained by the evaporation and chemical breakdown of wax delivered through a wick by capillary action.
The porous fuel-delivery component of a candle. Capillary action transports molten wax through its fibres to the region supplying gaseous fuel.
The capacity of a chemical substance to undergo combustion with a suitable oxidizing agent. It is a property, distinct from the combustible substance possessing it.
A chemical substance capable of sustaining combustion with an appropriate oxidizing agent under suitable conditions. Combustibility depends on the conditions and reaction partner.
The historical explanation that ordinary combustion and metallic calcination involve combination with oxygen, rather than release of phlogiston. It should not be extended into the false claim that every chemical acid contains oxygen.
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