Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:atomic_clock
|
| gptkbp:accuracy |
extremely high
|
| gptkbp:accuracyPerDay |
less than 1 nanosecond error
|
| gptkbp:builtBy |
gptkb:Louis_Essen
|
| gptkbp:category |
gptkb:frequency_standard
primary standard |
| gptkbp:establishedIn |
1955
|
| gptkbp:locationOfFirst |
gptkb:National_Physical_Laboratory,_UK
|
| gptkbp:measures |
gptkb:time_zone
|
| gptkbp:notableModel |
gptkb:NIST-F1
NPL-CsF2 |
| gptkbp:operatingSystem |
room temperature
|
| gptkbp:principle |
hyperfine transition of caesium-133 atom
|
| gptkbp:replacedBy |
quartz clock
|
| gptkbp:SISecondDefinition |
9,192,631,770 cycles of caesium-133 transition
|
| gptkbp:symbol |
Cs clock
|
| gptkbp:usedElement |
gptkb:caesium
|
| gptkbp:usedFor |
defining the second
|
| gptkbp:usedIn |
gptkb:GPS
international time standards |
| gptkbp:bfsParent |
gptkb:Atomic_Clocks
|
| gptkbp:bfsLayer |
8
|
| http://www.w3.org/2000/01/rdf-schema#label |
Caesium atomic clock
|