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Antimatter

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antimatter
n. matter composed of counterparts of ordinary matter (Physics)

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Antimatter
In particle physics, antimatter is material composed of antiparticles, which have the same mass as particles of ordinary matter but opposite charges, as well as other particle properties such as lepton and baryon numbers and quantum spin. Collisions between particles and antiparticles lead to the annihilation of both, giving rise to variable proportions of intense photons (gamma rays), neutrinos, and less massive particle–antiparticle pairs. The total consequence of annihilation is a release of energy available for work, proportional to the total matter and antimatter mass, in accord with the mass–energy equivalence equation, .

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antimatter

Noun
1. matter consisting of elementary particles that are the antiparticles of those making up normal matter
(hypernym) substance, matter
(substance-meronym) antiparticle


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Antimatter
A particle with precisely opposite properties to those of its matter counterpart. For example, the antimatter counterpart of an electron, known as a positron, has a positive charge, equal in strength to the negative charge of the electron. It also has an opposite spin. Antimatter is created in a process known as pair production. When antimatter comes into contact with its matter counterpart, the two particles are instantly annihilated by having their rest mass turned into energy and released as two photons electromagnetic radiation. The universe is predominantly composed of matter, since the laws of physics state that matter is produced with a slight but calculable bias over antimatter.

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