Gel - GCSE Biology Definition

A gel is a jelly-like substance that is mostly made up of a liquid but has properties of a solid. It is formed when tiny particles in the liquid form a network that traps the liquid in place, giving it a firm shape. In biology, gels can be used in different experiments, like gel electrophoresis, where they help to separate and analyse DNA fragments. Because they can hold their shape while still being mostly liquid, gels are useful in many scientific applications and can also be found in everyday products like hair gel and jelly.