The noun 泡沫 (pàomò) means "foam," "bubbles," or "froth." It can refer to physical foam (like soap bubbles) or be used metaphorically for economic bubbles (泡沫经济). It combines 泡 (bubble) with 沫 (froth).
孩子们开心地在浴缸里玩泡沫。
Háizimen kāixīn de zài yùgāng lǐ wán pàomò.
The children happily played with bubbles in the bathtub.
这杯啤酒上面有一层白色的泡沫。
Zhè bēi píjiǔ shàngmiàn yǒu yī céng báisè de pàomò.
There is a layer of white foam on top of this glass of beer.
很多经济学家担心房地产泡沫会破裂。
Hěn duō jīngjì xuéjiā dānxīn fángdìchǎn pàomò huì pòliè.
Many economists worry that the real estate bubble will burst.