Why is the sky blue?

Question

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Why does the sky change color?

Basically what the title says. What mechanisms are significant and how do they contribute to make the sky blue. Also when the sky is not blue, like when the sun sets, how does it happen?

Hello Andreas, Please have in mind, to refer to Wikipedia before asking such questions. It's also a duplicate... Be Careful while posting next questions.... — Waffle's Crazy Peanut, Oct 15 '12 at 17:29

score 1 · Accepted Answer · answered Oct 15 '12 at 17:15

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Because of scattering. Blue light scatters more then other colours, because of its high frequency.

For more information read

http://www.sciencemadesimple.com/sky_blue.html

answered Oct 15 '12 at 17:15

Prathyush

2,032

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It's better to avoid answering duplicated questions... :-) – Waffle's Crazy Peanut Oct 15 '12 at 17:19
I did not notice – Prathyush Oct 15 '12 at 17:20

score 1 · Answer 2 · answered Oct 15 '12 at 17:21

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Sunset & Sunrise sky is reddish coz red light with longer wavelength tend to travel longer in atmosphere.

And when Sun is up in the sky Blue light is reflected mostly by the gases in atmosphere. Visible lights with longer wavelengths pass right through(actually, around).

answered Oct 15 '12 at 17:21

जलजनक

261

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Hello Sparkot, Your answers are good. But, it won't be noticed 'cause it's already in this site. – Waffle's Crazy Peanut Oct 15 '12 at 17:27
Even still, the lack of information might confuse some. The red light is seen because scattering is high and red light isn't as scattered because it has a high wavelength ($~700\text{ nm}$) and Rayleigh says that scattering is inversely proportional to the 4th power of the wavelength. – Nick Mar 07 '15 at 11:02

Why is the sky blue?

2 Answers2

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