국제 표준화 기구(SI)에서 정한 진동수의 단위로, 1초 동안의 진동 횟수를 나타냄.
The SI unit of frequency, equal to one cycle per second.
예문:
"The human ear can typically hear sounds in the range of 20 to 20,000 hertz."
"The monitor has a refresh rate of 144 hertz for smoother motion in video games."
"The tuning fork vibrates at exactly 440 hertz, which is the standard pitch for musical tuning."