photon CHEBI:10581 CHEBI:30212 CHEBI:14383 gamma photon * chebi_ontology 0.0 hnu Light Lichtquant KEGG:C00205 foton 0.0 0 light quantum Particle of zero charge, zero rest mass, spin quantum number 1, energy hnu and momentum hnu/c (h is the Planck constant, nu the frequency of radiation and c the speed of light), carrier of electromagnetic force. boson