Glossary

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Looking for a quick definition?

We’ve got loads of key subject terms in our subject glossaries. There are three ways of finding what you are looking for:

  • First click on the letters of the alphabet to browse for terms.
  • Select a subject from the drop-down menu above to filter the terms by Subject.
  • Or lastly, type the term you are looking for into the search box.

EXAMPLES

Here are some examples of the kinds of definitions you’ll find on this page.

the part of the Earth and its atmosphere in which life can exist.

Niels Bohr put forward the theory that electrons move in certain orbits about the nucleus.

the temperature at which a substance changes phase from a liquid to a gas at a specific or fixed...

the process of separating bonded atoms from each other. The stronger the bond the more stable...

the amount of energy required to break a specific bond or the energy released when a specific...

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