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天空为什么是蓝色的? – 译学馆
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天空为什么是蓝色的?

World's Most Asked Questions: Why is the Sky Blue?

这个问题是所有问题的起源
It’s the mother of all questions!
不是”人生的意义是什么?” -因为这个问题我们每个人都有自己的
Well, except maybe What’s the Meaning of Life? — which we actually have our own scientific
答案……
answers to …
或者“什么是爱?”
Or What Is Love?
-我们对此也都有不同的理解
— We have some thoughts on that, too.
但在讲英语的国家中 搜索最多的那个问题是孩子们
But one of the most googled questions in the English-speaking world is the one that kids
超爱问的-但大人们却避之不及的 因为他们
are famous for asking — and grown-ups are notorious for avoiding, because they just
真的不知道
don’t know.
天空为什么是蓝色的?
Why is the sky blue?
几分钟内我就会让你明白究竟是为什么
Just give me a couple minutes and I’ll let you know why.
这里是世界上被问的最多的问题!
This is the World’s Most Asked Questions!
天空是蓝色的原因有三个因素:阳光 大气中的微粒
The sky is blue because of three things: light from the sun, particles in our atmosphere,
以及你是人类
and the fact that you’re a human.
一分钟后我就会讲最后一个因素
I’ll get to that last part in just a minute.
我们先来看阳光是如何同大气中的微粒发生反应的
But let’s start with how sunlight interacts with particles in the sky.
我指的不是尘埃 水滴 或其它大的微粒 它们常被
I’m not talking about dust or water droplets or other big particles, which are sometimes
误用来解释天空为什么是蓝色的
mistakenly used to explain the sky’s blueness.
相反 大气中的极小微粒才是天空看起来是蓝色的原因
Instead, it’s the very small particles in our atmosphere that make the sky look blue.
我是指是空气自身所包含的分子 大部分是氧气分子和氮气分子–O₂ 和 N₂
I’m talking about molecules of the air itself, mostly molecular oxygen and nitrogen — O₂ and N₂.
它们在大气中的含量十分丰富 而且很小
These molecules are super-abundant in our atmosphere and so small that they’re even
甚至比可见光的波长还要小
smaller than wavelengths of visible light!
而这就是关键
And that’s the key.
可见光光谱由不同波长的光组成
Visible light consists of a range — or spectrum — of different wavelengths.
波长最长的光在光谱红色末端
Light with the longest wavelengths are at the red end of the spectrum, and light with
波长最短的在光谱蓝色和紫色末端
the shortest wavelengths are at the blue and violet end.
因为蓝光波长更短 它们更容易受
Since the blue wavelengths of light are shorter, they’re more likely to strike those tiny
小的氧气和氮气分子阻碍 之后分子就会四处
molecules of oxygen and nitrogen more often, and when they do, they get scattered in all
散射
directions.
这种现象叫做瑞利散射 是由约翰·威廉·斯特拉特
This effect is known as Rayleigh scattering, because it was first described by John William
也叫瑞利男爵三世 他在1871年首次发表了数学证据证明
Strutt, aka the Third Baron Rayleigh, who in 1871 published his mathematical proof that
大气中 蓝光散射的频率是红光散射的16倍多
blue wavelengths of light in the atmosphere are scattered 16 times more than red wavelengths.
但紫光在可见光中波长最短 更容易被
But violet light has the shortest wavelength of all visible light, and it’s scattered
小微粒阻挡而发生散射 那为什么天空不是紫色的
even more strongly by tiny particles — so why isn’t the sky purple?
这就讲到了人的因素了
Well, this is where being human comes into play.
人眼对光谱中间的颜色最敏感 所以
Our human eyes perceive the middle of the spectrum most sharply which is why blue is
人类更容易看见蓝光
way easier to see than violet.
就算紫光四处散射 我们也很难像察觉到蓝光一样
So even though violet light is being scattered around like crazy, we just don’t detect
察觉到紫光
it as well as we detect the blue.
所以我们很难看到彩虹的紫色色带
And that’s why the violet band of the rainbow is often the hardest for us to make out.
科学秀 (SciShow) 的观众们很幸运 因为我们调查显示
So SciShow viewers are in luck, because when we surveyed you, the most popular favorite
彩虹颜色中大家最喜欢的就是蓝色
color from the rainbow was blue.
33.55%的受访者表示最爱蓝色
33.55% of survey takers reported blue as their favorite color, while yellow was the least
而只有2.8%的表示最爱黄色 最少
favorite at only 2.8%.
可怜的黄色
Poor yellow.
但有些动物能够看到光谱的所有颜色 包括紫外线
But, there are other animals that can see all the way into the ultraviolet end of the
如 蜜蜂和一些鸟类
spectrum, like honeybees and some birds.
它们可能喜欢黄色
So maybe they like yellow.
它们看见的天空也许也完全不同
And maybe the sky looks completely different to them.
大千世界无奇不有 你最想知道什么
Of all the fascinating questions in the world, what question do you want answered most?
在脸书 推特 或视频下方留言 我们会尽力
Let us know on Facebook or Twitter or in the comments down below, and we will try to answer
在本月末的新视频中给你答案
those questions in a new video at the end of the month.
记得加标签#WMAQ 继续关注 世界上问得最多的问题
And don’t forget to use hashtag #WMAQ and stay tuned for more answers to the World’s
我们给你答案
Most Asked Questions.

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视频概述

天空为什么是蓝色的?这个问题在英语国家搜索的次数最多,也是孩子们最好奇的。本视频介绍了造成天空看起来是蓝色的三大因素,以及“瑞利散射”现象。

听录译者

收集自网络

翻译译者

柯柯快乐

审核员

萨默之光

视频来源

https://www.youtube.com/watch?v=_Yli-yvNy-k

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