时差N小时 为什么肥皂水能吹泡泡?(上)（在线收听）

Even as adults we still enjoy blowing bubbles, don’t we?

即使我们已经成年但却仍然喜欢吹泡泡，对吧？

If you’ve ever wondered why blowing on a thin film of soapy water creates bubbles, this is your lucky day.

如果你也曾好奇为何肥皂水薄膜能吹出泡泡，那么今天就来帮你解惑。

All liquids have a property called surface tension. Take water, for example.

所有液体都有“表面张力”的特性，水也不例外。

Water molecules are strongly attracted to each other.

水分子会相互吸引。

Therefore the molecules on the surface of the water are not attracted towards the air, but rather towards the rest of the water.

因此，水表面的分子会被其余的水分子吸引，而不受空气分子吸引。

This attraction is what creates surface tension, forming a sort of skin on the water’s surface.

这种引力引发表面张力，继而在水面形成一层类似皮肤的薄膜。

Surface tension is also what accounts for soap bubbles.

表面张力也是肥皂泡的成因。

Dipping a wand into regular water won’t work because the water’s surface tension is so strong that the molecules would rather bunch together in a puddle than be stretched across the opening of the wand.

将“魔术棒”放入水中浸泡后无法吹出泡泡，这是由于水表面的张力太强，水分子会凝聚在一起，无法在“魔术棒”的开口处拉伸。