OEO Ontology

Overview / Open Energy Ontology / Class - second based unit
Label: second based unit
Sub classes:
second
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Definition:
"A time unit which is equal to 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 caesium 133 atom." [BIPM:BIPM, NIST:NIST]

Back to the super classes:
time unit
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Definition:
"A unit which is a standard measure of the dimension in which events occur in sequence." [Wikipedia:Wikipedia]