Why do certain liquids tend to foam while others do not?

为什么某些液体容易起泡，而有些则不行呢？

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As she emerged from her drifting cloud of gun smoke with the water churned to foam beneath her bow.

当“瓦萨”号从弥漫的礼炮烟云中出现时，船头下浪花加溅。

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Torres-Sanchez, along with colleagues at Strathclyde University, is experimenting with low-frequency ultrasonic irradiation to ‘excite’ molten polymers as they begin to foam.

托雷斯 - 桑切斯，与斯特拉斯克莱德大学的同事一起，正在试验当聚合物开始冒泡的时候，用低频率的超声波照射来“激发”熔融聚合物。

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Foam insulation damaged the shuttle's heat tiles during launch, which led to Columbia breaking apart upon re-entry.

VOA: standard.2009.07.16

CFCs are a smuggler's dream: odourless and colourless, they can be used in everything from air-conditioners to foam, and their replacements never quite match up to them.

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"Here you see all this energy directed at uttering a word, a sentence, but still there is the impossibility of talking or saying something, " says Davids, as her performers huddle behind the screens, their drying lips clamped to foam.

BBC: NEWS | Middle East | Iraq's war reaches the arts world

At present this is being used to house equipment used to make concrete foam to stabilise the nearby Coombe Down mines.

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