Hertz are used to measure cycles per second. Sound is measured in hertz. I hope I understood the question.
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Hertz.
-- Determine the number of revolutions, vibrations, reciprocations, or full oscillations in one second. -- Multiply that number by (2 pi).
It is called the frequency. The SI unit is the Hertz. One Hertz is one cycle per second.
Cycles per second (CPS) unless you are dealing with electrical, electro-magnetic, and electronic issues, in which case the 'vibrations' are measured in Hertz (Hz). The word is capitalized because its name comes from a person's name. The unit, "Hertz" is often mistakenly used when CPS is the correct unit.
-- take the number of meters per second-- divide it by 1,000-- the result is the number of kilometers per second