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为什么天空不是蓝紫色的?

Why Isn't The Sky Purple?

如果你懂天空为什么是蓝的 那你就明白
If you know the explanation for why the sky’s blue, you’ve heard that sunlight is white
阳光是由不同频率构成的自然光 高频的蓝光
light composed of many frequencies and that higher frequency, bluer, light scatters in
在空气中比低频的红光更易散射
the air more than lower frequency, redder, light.
也许你会问“既然蓝紫色频率比蓝光高
So, you might ask “why isn’t the sky violet, since violet is an even higher frequency than
为什么天空不是蓝紫的?”
blue?”.
首先 紫光和x射线跟蓝光比都属于高频
First off, ultraviolet light and x-rays are also higher frequency than blue, and that
这不意味着天空就是其它颜色
doesn’t mean the sky is the color of x-rays…
因为肉眼看不到射线并且太阳辐射的不多
Both because we can’t see them and also because the sun doesn’t make very many of them and
然后大气层阻碍了射线的进入可能是
then the atmosphere blocks them all – which is probably why we didn’t evolve to be able
看不到射线的原因
to see them.
第二 如同玫瑰红蓝紫罗兰那样 彩虹中的蓝紫色就是紫罗兰色
And secondly, the color violet in the rainbow is the “roses are red, violets are BLUE” violet.
并不是紫色 是暗蓝色
Not purple – it’s dark blue.
来看看为什么 看看这幅色度图
To see why, check out this Chromaticity Diagram!
它是由非色盲人士在忽略亮度和环境后
It’s a graph of all possible colors as perceived by non-colorblind humans, ignoring brightness
所能看到的所有颜色
and context.
你只知道图表中大概的颜色 遗憾的是
The color displayed on the diagram is just to give you a rough idea – unfortunately
电脑的色度有限 它只能显示出
your computer can’t display all possible perceived colors – it can just display the ones inside
三角区域里的这部分 然后拼凑出剩余的
a triangle like this, and is pretending for the rest.
像激光或将白光分裂成七色光后的单频光
Single frequency light like that from a laser or from splitting white light into a rainbow
绘制在外部边缘 然而在里面或底部的任何颜色
is graphed around this outside edge, while any color anywhere on the inside or along
只能由不同频率的光组合而成
the bottom edge can only be made with a combination of various frequencies of light.
如你所见 粉色紫色紫红色只能组合出来
As you can see, pink, purple and magenta can only be made using multiple frequencies of
没有单频的光会是粉色 当然 白光
light – there is no single frequency of light that’s pink – and of course, white light is
也是混合光
a mixture as well!
所以你看不到棱镜里的彩虹有这些颜色
Which is why you don’t see any of these colors in rainbows made from prisms.
但回到色度图
But back to the Chromaticity diagram!
看到中间的线了吗?
See this line in the middle?
表明高温物体颜色不同 有红热白热蓝热
This shows what color hot objects glow – we have red hot, then white hot, then blue hot.
所有这些热色都由宽频组成 因为这是
All of these “hot” colors are made up of a broad range of frequencies, since that’s what
高温物体本身
hot objects emit.
例如太阳到达大气层前是白热 然后阳光
The sun, for example, is white hot before it hits the atmosphere, then its light is
被空气颗粒散射 因此太阳看起来有点红热
split by scattering off of air molecules so the sun looks slightly red hot and the rest
剩余的天空看起来有点蓝热
of the sky looks kind of blue hot.
看这张日落的照片
Like this picture of a sunset!
如果你注意这条高温物体颜色线
And the thing is this – if you notice the line for hot-object color, well, it stops
它会终止在图标中间靠近白蓝色那
in the middle of the diagram near whitish-blue.
永远不会越过白蓝色
It never goes beyond that.
是因为温度比太阳还高的物体的光谱尾部
And that’s because the spectrum of light from an object hotter than the sun always has a
是递减的 比绿色红色更蓝一点 所以
decreasing tail, with slightly more blue than green than red, so you never get the right
你不知道紫色正确的频率分布 或就此来说
combination of frequencies to push the color towards purple, or for that matter, even towards
甚至纯深紫蓝色也不知道
a pure, deep violet blue.
有点像你混合不同比例的面粉和水来制作面包 煎饼
Kind of like how you can mix flour and water in different ratios to make bread, pancakes,
或素肉汁 但只要放了面粉 肉汁就不会是
or vegetarian gravy, but as long as you have flour in there, your gravy won’t be gluten
无麸质的
free.
这也是天空呈蓝白色的原因
And that’s why the sky appears blueish white.
它本质和肉汁一样
It’s basically gravy.

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视频概述

蓝紫色的频率比蓝色高,可天空为什么不是蓝紫色的呢?能否知道紫色是由什么频率的电磁波组成的?你很快就会知道了

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收集自网络

翻译译者

RicardoBM

审核员

审核员CX

视频来源

https://www.youtube.com/watch?v=R5P6O0pDyMU

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