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.
Here are some examples of the kinds of definitions you’ll find on this page.
the energy required to break the bonds of the reactants and start a reaction.
a remote sensing system that sends out radiation to a feature or area and sensors record the...
using photovoltaic technology to harness the energy from the sun and convert it into electrical...
the movement of molecules across a membrane against the concentration gradient, from an area of...