The kanji 沸 primarily conveys the idea of boiling, bubbling, or being agitated, often referring to liquids. It implies a state of intense activity, whether physically, like water boiling, or metaphorically, such as excitement or anger rising.

・On-yomi (音読み): フツ(futsu) ・Kun-yomi (訓読み): わく (waku), わかす (wakasu)

⚫︎沸騰 (ふっとう) Translation: Boiling; Ebullition ⚫︎沸点 (ふってん) Translation: Boiling point ⚫︎興奮で胸が沸き立つ (こうふんでむねがわきたつ) Translation: My heart is overflowing with excitement.

The kanji 沸 is a phono-semantic compound (形声文字, keisei moji). It is composed of two parts: 氵(さんずい, sansui), which is the radical indicating water, and 弗 (futsu), which serves as the phonetic component and gives the sound. The combination of water and the sound element 弗 suggests the action of water bubbling or boiling. The character's form has remained relatively consistent over time.