Oxygen (O2)
Oxygen is essential to support any combustion; combustion is a chemical process of oxidation.
It does not support combustion...
The chemicals caused by combustion are dangerous.
Chlorine gas supports the vigorous combustion of many elements to form their chlorides. For example, Sulphur and Phosphorus burn in the gas.
combustion
Hydrogen is a fuel for combustion, but cannot support it in the manner than oxygen can.
The materials of the candle as waxes, paraffin.
No. The sun is about 1% oxygen but it does not carry out combustion. It is instead powered by nuclear fusion.
No the atmosphere will not support combustion.
No. There is noting to support combustion on Jupiter.
Oxygen.
Combustion generally requires at least 16% oxygen in the air for sustained burning. This is known as the oxygen concentration level necessary to support combustion. If the oxygen level falls below this threshold, combustion may not occur or may be incomplete.