The hertz (symbol: Hz) is the SI unit of frequency. Its base unit is s-1 (also called inverse seconds, reciprical seconds, or 1/s). In English, hertz is used as both singular and plural. Read more

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Rotational speed

Angular velocity

Frequency is the measurement of the number of occurrences of a repeated event per unit of time. It is also defined as the rate of change of phase of a sinusoidal waveform. Read more