Chemically, an oxidizer accepts electrons and the fuel supplied to them. In the context of high-energy materials, it is an important ingredient of propellants that releases oxygen to enable the combustion of a fuel. Most types of burning on Earth use oxygen, which is prevalent in the atmosphere.

Why does fuel need an oxidizer?

Fuel is the substance that burns to create the expanding gasses that power a rocket engine. In order for anything to burn, you need oxygen or something chemically similar: an oxidizer. Oxidizers become necessary in the vacuum of space, where there is no oxygen to help ignite the fuel.

What is the role of oxidizer in chemical reaction?

An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced.