赫兹 Hertz
（重定向自Femtohertz）
赫兹（英语：Hertz）是计算频率的单位，属于公制的一种，意为每秒的周期运动次数。其命名取自德国物理学家海因里希·赫兹，符号是「Hz」。
Femtohertz
中文百科
英语百科
Hertz 赫兹
（重定向自Femtohertz）
![Top to bottom: Lights flashing at frequencies f = 0.5 Hz (hertz), 1.0 Hz and 2.0 Hz, i.e. at 0.5, 1.0 and 2.0 flashes per second, respectively. The time between each flash – the period T – is given by 1⁄f (the reciprocal of f), i.e. 2, 1 and 0.5 seconds, respectively.](/Images/godic/202501/12/FrequencyAnimation3522.gif")
![A sine wave with varying frequency](/Images/godic/202501/12/Wave_frequency3522.gif")
![Details of a heartbeat as an example of a non-sinusoidal periodic phenomenon that can be described in terms of hertz. Two complete cycles are illustrated.](/Images/godic/202501/12/Wiggers_Diagram.svg3522.png")
![](/Images/godic/202501/12/SI_base_units.svg3522.png")
The hertz (symbol Hz) is the unit of frequency in the International System of Units (SI) and is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.