E

Electrical conductor     A substance that allows electricity to flow through it without any chemical change taking place.

Electrolysis     The chemical change that is brought about by passing electricity through a substance. The substance must be ionic and either molten or in aqueous solution.

Electron     An atomic particle of very small mass (1/1840 of the mass of a proton) and a charge of one minus. It is found in an atom in shells or orbits surrounding the nucleus but not part of the nucleus.

Element     This is a substance that is composed of only one kind of atom. All the atoms in an element are the same. A chemical reaction cannot break an element into anything simpler.

Erosion     This is the transport (movement) of bits of rock after they have been broken down weathered).

Evaporation     A liquid turning into a gas. Although a liquid may evaporate (from its surface) at any temperature, it can only boil at its boiling point.

Expansion     When a substance is heated, it expands or gets bigger. Some people think (incorrectly) that it is the particles themselves that are getting bigger but this is not true. Instead, the substance expands because the particles are moving more violently.

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