second - Ontology Browser - Rat Genome Database

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Term:

second (MI:0649)
Annotations: Rat: (0) Mouse: (0) Human: (0) Chinchilla: (0) Bonobo: (0) Dog: (0) Squirrel: (0) Pig: (0) Naked Mole-rat: (0) Green Monkey: (0)

Parent Terms

Term With Siblings

Child Terms

parameter unit + is-a

kelvin

molar

per mole per second

second

The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom. The second was originally defined as 1/86 400 mean solar day until astronomers discovered that the mean solar day is actually not constant.

Synonyms
Exact Synonyms:	s ; sec
Definition Sources:	PMID:14755292

RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.