沸 means “boil, seethe”

わく · waku

Also: ferment, uproar

Kun'yomi (Japanese reading)

わく, わかす

On'yomi (Chinese reading)

フツ

JLPT N2 · Taught in secondary school · 8 strokes

The story

Water (氵) beside 弗, strokes twisting through two upright lines: picture bubbles churning up through a pot. お湯が沸く is water coming to the boil, and a crowd 沸く too, roaring when the home team scores.

Used in 沸く (waku, to boil), 沸かす (wakasu, to bring to the boil), and 沸騰 (futtou, boiling)

More from Kitchen & Chores

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• 溶 dissolve
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• 瓶 bottle
• 缶 can

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.