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loading...| Preferred Name |
second |
| Synonyms |
sec s |
| Definitions |
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. |
| ID |
http://purl.obolibrary.org/obo/MI_0649 |
| definition |
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. |
| has_exact_synonym |
sec s |
| has_obo_namespace |
PSI-MI |
| id |
MI:0649 |
| in_subset | |
| label |
second |
| notation |
MI:0649 |
| prefLabel |
second |
| treeView | |
| subClassOf |
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