赫茲
赫茲，或者就咁叫赫（拉丁字母：Hertz），係頻率嘅國際單位制單位，係指每秒中嘅週期性變動重複嘅次數。後人為咗紀念德國物理學家海因里希赫茲（Heinrich Hertz）嘅貢獻，重用佢個姓嚟命名呢個單位。符號係 Hz。
1Hz = 1/s
赫茲衍生嘅單位
| 1 千赫 | kHz | 103 Hz | 1 000 Hz |
| 1 兆赫 | MHz | 106 Hz | 1 000 000 Hz |
| 1 秭赫 | GHz | 109 Hz | 1 000 000 000 Hz |
| 1 澗赫 | THz | 1012 Hz | 1 000 000 000 000 Hz |
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