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Did you know that sound travels through the air at speeds of over 700 mph? That's faster than most airplanes.
你知道声音在空气中的传播速度达到了700多英里/小时吗？这比绝大多数飞机都要快。
And I bet you didn't know that sound travels even faster through water.
我打赌你肯定不知道声音在水中传播得更快。
Really?
真的吗？
Yep, sound travels through water at 3,400 mph, that's four times faster than it travels through air.
是的，声音在水中的传播速度是3400英里/小时，是在空气中传播速度的四倍。
That's pretty fast! But why does sound travel faster through water than it does air?
确实是相当快啊！但是为什么声音在水中比在空气中传播得快呢？
Well, sound travels through vibrations of molecules.
嗯，声音是通过分子振动传播的。
Now, some kinds of molecules just naturally send those vibrations along faster, and distance is also a factor.
有些分子自然地会更快地传递这些振动，而距离也是一个因素。
When sound travels through a material where the molecules are far apart, the sound travels slower.
当声音在分子间距很远的介质中传播时，其速度会慢一些。
And when sound travels through a material where the molecules are very close together, the sound travels faster.
而当声音在分子间距非常近的介质中传播时，其速度会更快。
When you compare air and water, air molecules are farther apart, while water molecules are much closer together.
拿空气和水作比较，空气的分子间距离更远，而水的分子间距离更近。
This means sound will travel faster through water than it will through air.
这就意味着声音在水中的传播速度比在空气中的传播速度快。
Interesting! So does that mean sound can travel even faster through some metals where molecules are extremely close together?
真有趣！那么，这是否意味着声音在一些分子间距离非常近的金属中传播得更快呢？
That's right.
没错。
