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Hertz

zh-cn:赫兹

The hertz (symbol Hz) is the SI unit of frequency. It is named in honor of the German physicist Heinrich Rudolf Hertz who made some important contributions to science in the field of electromagnetism.

One hertz simply means "one per second"; 100 Hz means "one hundred per second", and so on. The unit may be applied to any periodic event – for example, a clock might be said to tick at 1 Hz.

In older writings, the equivalent unit cycle per second (cps) is seen.

SI Multiples

1 kilohertz (symbol kHz) = 103 Hz = 1,000 Hz
1 megahertz (symbol MHz) = 106 Hz = 1,000,000 Hz
1 gigahertz (symbol GHz) = 109 Hz = 1,000,000,000 Hz
1 terahertz (symbol THz) = 1012 Hz = 1,000,000,000,000 Hz
1 petahertz (symbol PHz) = 1015 Hz = 1,000,000,000,000,000 Hz
1 exahertz (symbol EHz) = 1018 Hz = 1,000,000,000,000,000,000 Hz

Examples