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abstraction > mathematical concept > unit > frequency unit > hertz
Upfrequency unit, named derived SI unit

hertz comparison table
Subject is an acronym for has base unit has unit has definition has symbol is a kind of is an instance of is a unit of
frequency unit     unit frequency
named derived SI unitSyteme Internationaledefined in terms of the seven SI base units via a system of quantity equationsdefined in terms of derived SI unit via a system of quantity equations  derived SI unit  
hertzSyteme Internationales-1defined in terms of derived SI unit via a system of quantity equationsA unit of frequency equal to one cycle (or wave) per second.Hzfrequency unitnamed derived SI unitfrequency

Upfrequency unit, named derived SI unit