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Category:OSWf96feb3f44384e43aa447458c4d87fc2
The frequency standard in the SI system in which the photon absorption by transitions between the two hyperfine ground states of caesium-133 atoms are used to control the output frequency. It defines the base unit second in the SI system. +
HyperfineTransitionFrequencyOfCs (en) +
f96feb3f-4438-4e43-aa44-7458c4d87fc2 +
Equivalent URI"Equivalent URI" is a type and predefined property provided by Semantic MediaWiki to represent URI/URL values.
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