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A subatomic particle having the same mass as a given particle but opposite electric or magnetic properties. Every kind of subatomic particle has a corresponding antiparticle, e.g. the positron has the same mass as the electron but an equal and opposite charge.
- ‘One can imagine atoms that are made of antiparticles: antiprotons, antineutrons, and positrons.’
- ‘Positively charged beta particles, the antiparticle of electrons, are called positrons.’
- ‘At about one second into the life of the universe, the majority of existing particles and antiparticles had been destroyed to produce photons of electromagnetic radiation.’
- ‘Some neutral particles such as photons are their own antiparticles, while others like neutrons have antiparticles with opposite magnetic moments.’
- ‘Note that subatomic particles sometimes have antiparticles, with opposite charge and spin, that are the same ones going backwards in time.’
We take a look at several popular, though confusing, punctuation marks.
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The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.