沸騰（ふっとう、fuっtou）
- boiling

The Japanese word 沸騰 （ふっとう, *futtou*) means "boiling" or "to boil." It describes the process where a liquid rapidly changes to a vapor due to the application of heat. It can also be used figuratively to express a state of intense excitement, anger, or activity. Think of it like a pot of water bubbling vigorously on a stove, or a situation that's reaching a critical point. ⚫︎ It can refer to the physical act of a liquid boiling. ⚫︎ It can also refer to something becoming extremely heated or excited.

⚫︎ お湯が沸騰］するまで待ちましょう。 Translation: Let's wait until the water boils. ⚫︎ デモは次第に沸騰］し、警察との衝突に発展した。 Translation: The demonstration gradually heated up and escalated into a clash with the police. ⚫︎ 観客は興奮して沸騰］していた。 Translation: The audience was excited and boiling over.

You can use 沸騰 in various contexts: ⚫︎ To talk about the literal boiling of a liquid, such as water or soup. ⚫︎ To describe a situation where emotions are running high, like during an argument or a sports game. ⚫︎ To talk about a situation where activity or progress is accelerating. ⚫︎ It is often used in formal situations and news reports, especially when describing an emotional or political situation.

沸騰 is typically written in kanji 沸騰, with the reading ふっとう in hiragana. ⚫︎ The kanji 沸 （*futsu* or *waku*） means "to boil," and 騰 （*tou*） means "to rise" or "to soar." ⚫︎ There are no variations in okurigana. ⚫︎ Sometimes, you might see the verb form, which can be 沸騰］する (*futtou suru* - to boil) or 沸騰］した (*futtou shita* - boiled/boiling/boiled over).

⚫︎ 煮立つ (*nitatsu*) - to boil (more general). ⚫︎ 煮える (*nieru*) - to boil (intransitive, like something cooking). ⚫︎ 高まる (*takamaru*) - to rise; to increase (used figuratively) ⚫︎ エスカレートする (*esukarēto suru*) - to escalate (borrowed word)

⚫︎ 冷める (*sameru*) - to cool down (physically or emotionally). ⚫︎ 沈静化する (*chinchika suru*) - to calm down; to quiet down. ⚫︎ 静まる (*shizumaru*) - to become calm; to quiet down.

鍋の中の水が沸騰］し始めた。 ・Translation: The water in the pot started to boil. ・Explanation: This sentence describes the physical process of water boiling in a pot.

そのニュースを聞いて、会場は一気に沸騰］した。 ・Translation: Upon hearing that news, the venue instantly erupted in excitement. ・Explanation: This sentence uses 沸騰 figuratively to describe the sudden increase in excitement and activity in a place.

The word 沸騰 is a compound word formed from the kanji 沸 (boil) and 騰 (rise or soar). It accurately describes the action of a liquid 沸 becoming vapor and 騰 rising, hence, boiling. It's a direct representation of the physical process.