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Boiling - GCSE Chemistry Definition

Reviewed by: Philippa Platt

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Boiling is a physical change where a liquid turns into a gas as it is heated to its boiling point. This process occurs when the liquid's vapour pressure equals the external pressure exerted on it, causing bubbles of vapour to form within the liquid and rise to the surface.

For example, water boils at 100°C under standard atmospheric pressure. It differs from evaporation, which happens only at the surface of the liquid.

Understanding the boiling process is crucial for GCSE Chemistry students as it illustrates key concepts like energy transfer, phase changes, and the effect of pressure on boiling points.

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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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