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Combustion - GCSE Chemistry Definition

Reviewed by: Philippa Platt

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Combustion is a chemical reaction that happens when a substance reacts with oxygen and releases energy in the form of heat and light. This process is commonly known as burning.

For example, when wood burns in a fireplace or petrol fuels a car engine, combustion is taking place. This reaction usually produces carbon dioxide and water as by-products. The hydrocarbon methane combusts as follows:

methane + oxygen ⟶ carbon dioxide + water

CH4 + 2O2 ⟶ CO2 + 2H2O

It's important to note that for combustion to occur, three things are needed: fuel, oxygen, and heat. This concept is often referred to as the fire triangle. Combustion reactions are a key part of energy production and are studied in the GCSE Chemistry course to understand how fuels release energy.

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Philippa Platt

Reviewer: Philippa Platt

Expertise: Chemistry Content Creator

Philippa has worked as a GCSE and A level chemistry teacher and tutor for over thirteen years. She studied chemistry and sport science at Loughborough University graduating in 2007 having also completed her PGCE in science. Throughout her time as a teacher she was incharge of a boarding house for five years and coached many teams in a variety of sports. When not producing resources with the chemistry team, Philippa enjoys being active outside with her young family and is a very keen gardener

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