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NALT Concept Space
U.S. Department of Agriculture

NALT Full

Concept information

  1. Research, Technology, Methods
  2. research
  3. animal research
  4. chemical substances
  5. elementary particles
  6. photons

Preferred term

photons

Type

  • Chemical

Definition

  • Information 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.

    Source: Medical Subject Headings 2016

    Type: Concept definition

Broader concept

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URI

https://lod.nal.usda.gov/nalt/273158

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RDF/XML TURTLE JSON-LD Created 2/25/16, last modified 4/3/18