Related MeSH Hierarchy (5)
Phenomena and Processes [G] » Physical Phenomena [G01] » Elementary Particles » Photons
Phenomena and Processes [G] » Physical Phenomena [G01] » Magnetic Phenomena » Electromagnetic Phenomena » Electromagnetic Radiation » Light » Photons
Phenomena and Processes [G] » Physical Phenomena [G01] » Optical Phenomena » Light » Photons
Phenomena and Processes [G] » Physical Phenomena [G01] » Radiation » Electromagnetic Radiation » Light » Photons
Phenomena and Processes [G] » Physical Phenomena [G01] » Radiation » Radiation, Nonionizing » Light » Photons
Description
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) MeSH
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