Substance
photon
pho·ton [ foh-ton ]
Subclass of:
Elementary Particles
Definitions related to photons:
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A single unit of electromagnetic radiation, generally considered to be a discrete particle having no mass or charge.NCI ThesaurusU.S. National Cancer Institute, 2021
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Discrete concentrations of energy, apparently massless elementary particles, that move at the speed of light. They are the unit or quantum of electromagnetic radiation. Photons are emitted when electrons move from one energy state to another. (From Hawley's Condensed Chemical Dictionary, 11th ed)NLM Medical Subject HeadingsU.S. National Library of Medicine, 2021
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