泡沫
pào mò · HSK 7
foam
🫧🧼 泡 (bubble) + 沫 (froth) = foam; both share the 氵water radical
泡 pào means a bubble or to soak; 沫 mò means froth or spittle. Stacked together they name the foam on soapy water or a beer, and by extension an economic bubble that froths up then pops.
泡 — water radical 氵 + wrap 包
泡 is a phono-semantic compound. The water radical 氵 gives the meaning (related to liquid), while 包 (bāo, 'wrap/enclose') supplies the sound and hints at something enclosed. Originally it described bubbles—pockets of air wrapped by water—and later extended to soaking or steeping.