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 levels of energy in which electrons move and which have fixed amounts of energy.

the difference between the energy absorbed to break bonds and the energy transferred to the...

everything around, and excluding, the chemical system itself.

the ratio of the concentration of the products to the concentration of the reactants in a...

elements that are essential to sustain life.

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