Frequency
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 
Frequency
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Angular velocity

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 
