Hz is the written short form of hertz, the unit for frequency — how many times something happens in one second. A sound of 440 Hz repeats 440 times each second.

Hz is the written short form of hertzHz是 hertz赫茲的書面簡寫, the unit for frequency也就是頻率的單位 — how many times something happens in one second指某件事一秒鐘發生幾次。A sound of 440 Hz repeats 440 times each second440 Hz的聲音就是每秒重複440次。

You will see Hz on headphones, speakers, screens (how many times the picture refreshes), and in science books. You write a number and then Hz, often with a space: 50 Hz.

You will see Hz on headphones, speakers, screens你會在耳機、喇叭、螢幕上看到 Hz (how many times the picture refreshes)（畫面一秒更新幾次）, and in science books還有科學書籍裡也會看到。You write a number and then Hz你會先寫數字再寫 Hz, often with a space中間常常空一格: 50 Hz像 50 Hz。

You say the full word “hertz,” not the letters H-Z. The usual written form is a capital H and a small z (Hz).

You say the full word “hertz,”你會唸出完整的字「hertz」, not the letters H-Z而不是唸字母 H-Z。The usual written form is a capital H and a small z (Hz)一般的寫法是大寫 H加小寫 z，也就是 Hz。

The unit is named after Heinrich Hertz, a German scientist. One hertz is once per second; a kilohertz (kHz) is a thousand hertz, and a megahertz (MHz) is a million.

The unit is named after Heinrich Hertz, a German scientist這個單位是以德國科學家 Heinrich Hertz赫茲命名的。One hertz is once per second一赫茲就是一秒一次; a kilohertz (kHz) is a thousand hertz千赫茲 kHz是一千赫茲, and a megahertz (MHz) is a million而百萬赫茲 MHz則是一百萬赫茲。

Though actually, Hz is only for things that repeat in a regular way; it is not a word for loudness, and it is not the same as speed on the road.

Though actually不過其實, Hz is only for things that repeat in a regular wayHz只用在有規律重複的東西上; it is not a word for loudness它不是用來講音量大小的字, and it is not the same as speed on the road也跟馬路上講的速度不一樣。