Plural of hertz, the unit of frequency equal to one cycle per second, named after physicist Heinrich Hertz.
From Heinrich Hertz (1857-1894), a German physicist who proved electromagnetic radiation, + the plural suffix '-es.' Named in his honor in 1930 by international agreement.
The hertz is one of the few SI units named after someone from a non-English-speaking country, showing that physics language is truly international—and Hertz's work directly enabled radio, wireless technology, and modern telecommunications.
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