Flammable Gases and Oxygen Combustion

Only in the presence of carbon dioxide

When the gas/air mixture is correct (correct)

Regardless of the gas/air mixture

Only in the absence of air

Higher temperature

Lower pressure

Correct gas/air mixture (correct)

Absence of any other gases

When the temperature is too low

When the gas/air mixture is incorrect (correct)

When there is insufficient nitrogen

When there is excess carbon dioxide