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P A Q

Physics Answer Questions

What is anti-matter? Could someone explain it a bit more to me?

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  • Q : I am currently learning about nuclear reactions in Chem and I was wondering if someone could elaborate on it for me. Thanks guys.
  • A : For every elementary particle (electron, proton or neutron, for instance), there exists an anti-particle. This comes about from the theory of relativistic quantum mechanics, first formulated by Dirac. These (and many others) have been experimentally observed in particle accelerators. The real mystery is why there is an abundance of matter over anti-matter in the universe since the expectation is that there would be an equal amount of each. But current understanding is that, shortly after the big bang, there copious amounts of matter and anti-matter which annihilated into photons, except for a slight (about 1 in 10^5) excess of matter - which is what formed the large scale structures (stars and galaxies) that we see. To confuse you further, there appears to be about five times more "dark matter" in the universe - and we do not know what that is.
    Good luck with your studies.

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