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antiparticle
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electrons and positrons in a bubble chamber proton-antiproton collision
Learn about antimatter and its properties, and understand the annihilation of matter and antimatter
Quizzes
Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.
Physics and Natural Law
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Atom illustration. Electrons chemistry physics matter neutron proton nucleus
What Is Antimatter?
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The 10 Greatest Basketball Players of All Time
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20 Paintings You Have to Visit at the Museo del Prado in Madrid
Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics
10 Best Hockey Players of All Time

antiparticle

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antiparticle, subatomic particle having the same mass as one of the particles of ordinary matter but opposite electric charge and magnetic moment. Thus, the positron (positively charged electron) is the antiparticle of the negatively charged electron. The spinning antineutron, like the ordinary neutron, has a net electric charge of zero, but its magnetic polarity is opposite to that of a similarly spinning neutron. The neutrino, an uncharged particle that travels very close to the speed of light, spins counterclockwise as viewed from behind, whereas the antineutrino spins clockwise as viewed from behind. A particle and its antiparticle mutually react to produce energy by annihilation.

The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Erik Gregersen.