# Oxygen _____ combustion and is ______ itself

Oxygen supports combustion and is non-combustible itself.

• Air or oxygen, which helps in burning, is called a supporter of combustion, and the chemical reaction which takes place with the release of heat and light energy is called combustion.
• The substances which undergo combustion are known as combustible substances.
• Oxygen is by itself non-flammable. But to cause combustion, it needs fuel, i.e. something that can burn.