十万个为什么·科学阅读30篇（5）
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Why Do Bubbles Pop So Easily?
为什么泡泡那么容易破？
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Soap bubbles are thin films of water sandwiched between soap layers.肥皂泡是夹在两层肥皂膜之间的薄水膜。
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Water molecules pull tightly on each other at the surface.水分子在表面彼此紧密拉扯。
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Even a tiny poke breaks this delicate balance and makes it collapse.哪怕轻轻一碰，也会打破这种微妙平衡，导致破裂。
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Dry air pulls water out of the film, making it thinner fast.干燥空气会迅速抽走膜中的水分，使其快速变薄。
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Dust or oil on your hand adds weak spots where popping starts.手上的灰尘或油脂会在膜上形成薄弱点，成为破裂起点。
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Gravity also pulls water downward, thinning the top of the bubble.重力也会将水向下拉，使泡泡顶部变薄。
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That’s why bubbles last longer in humid, still rooms.因此，在潮湿、无风的房间里，泡泡存留时间更长。
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They pop with a soft pop when surface tension fails.当表面张力失效时，泡泡会发出轻微的“啪”声而破裂。