Meaning
The kanji 爆 (baku) captures the essence of an explosion, a burst, a blast, or a sudden, loud pop. It's a powerful kanji, conjuring images of destruction, rapid expansion, and intense energy release. Beyond literal explosions, its meaning extends to figurative bursts, such as a burst of laughter or a sudden surge in popularity.
Like many kanji, 爆 is a semantic-phonetic compound. On the left, you'll find the radical 火 (hi), meaning fire. This radical immediately links the kanji to combustion, heat, and destructive power. The right side, 暴 (bō, abaru), contributes meanings like violence, suddenness, or 'to burst forth'. This element not only reinforces the kanji's meaning of sudden, often violent action, but also provides its phonetic clue, as バク (baku) relates to 暴 (bō).
Visually, imagine fire (火) igniting something that then violently bursts forth (暴) – this perfectly encapsulates the idea of an explosion. This kanji has a total of 15 strokes, making it relatively complex to write. As a Jouyou kanji, it's officially designated for general use, though it's not tied to a specific elementary school grade. Students usually encounter and learn 爆 in junior high or high school, making it an N2-level kanji.
Readings
Like most kanji, 爆 has distinct On'yomi (Chinese-derived) and Kun'yomi (native Japanese-derived) readings. However, for 爆, its On'yomi is significantly more common in modern Japanese.
On'yomi (音読み) — Chinese-derived readings
The main On'yomi for 爆 is バク (BAKU). This reading is highly common, appearing in almost all compound words related to explosions, sudden bursts, or intense, rapid actions. N2 learners should master this reading and its associated compounds.
- 爆発 (bakuhatsu) — explosion, burst, eruption
Example: 火山が爆発した。 (Kazan ga bakuhatsu shita.) — The volcano erupted.
- 爆弾 (bakudan) — bomb
Example: 時限爆弾が仕掛けられた。(Jigen bakudan ga shikakerareta.) — A time bomb was planted.
- 爆笑 (bakushō) — burst of laughter, roaring laughter
Example: みんなが彼のジョークに爆笑した。(Minna ga kare no jōku ni bakushō shita.) — Everyone burst into laughter at his joke.
Kun'yomi (訓読み) — Native Japanese readings
While 爆 technically possesses associated Kun'yomi readings, you'll rarely encounter the kanji 爆 used with them in isolation. These concepts are more commonly expressed using other kanji like 弾 (for bursting) or simply written in hiragana. When 爆 is specifically chosen for these readings, it typically emphasizes a more forceful, violent, or explosive kind of burst.
- はじける (hajikeru) — to burst, to pop, to crack open
This verb describes something bursting open, such as popcorn or a bubble.
- ポップコーンが弾ける (poppukōn ga hajikeru) — Popcorn pops.
(Note: While 爆ける is technically possible, 弾ける or はじける are significantly more common and natural for everyday use.)
- はぜる (hazeru) — to burst, to pop, to crackle
Similar to はじける, はぜる describes things bursting or crackling, like wood in a fire.
- 炭が弾ぜる (sumi ga hazeru) — Charcoal crackles.
(Note: 爆ぜる is occasionally seen in technical or literary contexts to emphasize an explosive crackle, but 弾ぜる or はぜる are generally preferred.)
Common Words & Compounds
To truly grasp 爆, it's essential to understand its role in compound words. Below are some of the most common and useful compounds, grouped for easier learning:
Words Related to Explosions and Demolition
- 爆弾 (bakudan) — bomb, explosive device
A device designed to explode.
- 爆発 (bakuhatsu) — explosion, burst, eruption, blast
The act of exploding or a sudden, forceful release.
- 爆破 (bakuha) — demolition, blasting, blowing up
The act of intentionally destroying something with explosives.
- 爆撃 (bakugeki) — bombing (attack)
An attack carried out by dropping bombs.
- 爆薬 (bakuyaku) — explosive (material)
The material used to cause an explosion.
Words Describing Sudden or Intense Actions/States
- 爆笑 (bakushō) — burst of laughter, roaring laughter
A sudden, loud, and uncontrollable fit of laughter.
- 爆速 (bakusoku) — explosive speed, extremely fast
Used informally to describe something moving or operating at incredibly high speed.
- 爆買い (bakugai) — shopping spree, explosive buying
A term referring to sudden, large-scale purchasing, often by tourists.
- 爆食い (bakugui) — binge eating, explosive eating
Eating a large quantity of food in a short period.
- 爆睡 (bakusui) — deep sleep, explosive sleep
Informal term for sleeping very soundly and heavily.
Related Concepts and Forms
- 被爆 (hibaku) — exposure to bombing/radiation
Often refers to being exposed to an atomic bomb or radiation.
- 自爆 (jibaku) — self-destruction, suicide bombing
The act of blowing oneself up, or self-destructing.
- 爆発的 (bakuhatsuteki) — explosive (adjective), dramatic, phenomenal
Describes something with the force or suddenness of an explosion.
Example Sentences
These example sentences illustrate how 爆 is used in everyday Japanese, moving from simple to more complex scenarios. Paying attention to the particles and grammar will help you fully grasp their usage.
ガスが漏れて、爆発の危険がある。
Gasu ga morete, bakuhatsu no kiken ga aru.
Gas is leaking, and there's a danger of explosion.
子供たちは漫画を読んで爆笑した。
Kodomotachi wa manga o yonde bakushō shita.
The children burst into laughter reading the manga.
テロリストが爆弾を仕掛けたと警察に通報があった。
Terorisuto ga bakudan o shikaketa to keisatsu ni tsūhō ga atta.
The police received a report that terrorists had planted a bomb.
その歌手の人気は爆発的に上昇した。
Sono kashu no ninki wa bakuhatsuteki ni jōshō shita.
That singer's popularity dramatically soared.
週末は疲れて、ずっと爆睡していた。
Shūmatsu wa tsukarete, zutto bakusui shite ita.
I was tired on the weekend and slept very heavily the whole time.
この新しい車は爆速で、あっという間にゴールした。
Kono atarashii kuruma wa bakusoku de, attoiuma ni gōru shita.
This new car has explosive speed and reached the goal in no time.
スーパーの特売日には、お客さんが爆買いする。
Sūpā no tokubaibi ni wa, okyaku-san ga bakugai suru.
On special sale days at the supermarket, customers go on a shopping spree.
映画のクライマックスで、大規模な爆破シーンがあった。
Eiga no kuraimakkusu de, daikibo na bakuha shīn ga atta.
There was a large-scale demolition scene at the climax of the movie.
旧い建物は爆薬を使って解体された。
Furui tatemono wa bakuyaku o tsukatte kaitai sareta.
The old building was demolished using explosives.
平和な世界のために、核爆弾の廃絶が求められている。
Heiwa na sekai no tame ni, kakubakudan no haizetsu ga motomerarete iru.
For a peaceful world, the abolition of nuclear bombs is demanded.
Memory Tip
To remember 爆 (baku), visualize its components: 火 (fire) on the left and 暴 (violence/burst forth) on the right. Think of it as a story: when fire (火) is involved in a violent (暴) or sudden bursting action, it results in an explosion (爆). Imagine a small fire suddenly getting out of control, acting violently, and then bursting into a huge explosion. The fire element is fundamental to an explosion, while the right component evokes its forceful and uncontrolled nature. Thus, fire + violence/burst = explosion!