Particles such as electrons, protons, and neutrons that are the "constituents" of matter and account for its impenetrability. Other particles -- called, "bosons" -- mediate, or carry, forces between fermions. Examples would be photons, gravitons, and gluons.

Glossary Index | Next >
To return to the previous topic, click on your browser's 'Back' button, or select from the topics list.