Posted by mmmmpf 6 years ago In:

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mmmmpf
mmmmpf Asked:

Blue sky

how come the sky are blue and not for exhample black or any other color?

*i already know its due to the density of the atmospheire, my question is why our atmospheire absorbs the other colors more than the blue color*

so, im asking why our atmospheire absorbes the blue color and not the other

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kwheaton
kwheaton Answered:

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light.

For the full answer, see this site.

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mmmmpf
mmmmpf Answered:

well yes I already new that.

i'll rewrite my question.

plz try to answer on it again

thank you.

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knownot
knownot Answered:

See:  http://yedda.com/questions/8621649071110/
The atmospheire obsorbes all colors and then scatters the light in such a way that you will see only blue.

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nathanael56
nathanael56 Answered:

 While the molecules that make up the earths atmosphere (76% N2, 21% O2 plus other trace gases) do not absorb light in the visible light spectrum, they do resonate with blue light. (wavelengths in the neighborhood of 450nm I think.) When the blue light hits the air molecules it they reflect light in different directions. The end result is that the sky is blue.

Similarly when the sun is setting, the light travels a long way through the atmosphere before it gets to you. When it finally does, all the blue light has been filtered (reflected) out, giving the sun it's red appearance.

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knownot
knownot Answered:

I couldn't find on the web what you are saying about the air molecules resonate in blue light as the cause for blue sky.

Do you have a reference for this information?

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