Oxidise is a chemical reaction in which oxygen combines with another substance, often resulting in the formation of RUST, oxygenation, HEAT, FLAME, and burning. RUST is a reddish-brown coating that forms on iron or steel when exposed to air and moisture. Oxygenation is the process of adding oxygen to a substance. HEAT is energy that is transferred from one object to another due to a difference in temperature. FLAME is a hot glowing body of ignited gas that is produced by a chemical reaction. Burning is the process of oxidizing a material, usually with HEAT or fire.