why sky is blue?

Answer 1

The sky is blue due to an atmosphetic effect called Rayleigh scattering - certainly not because its reflecting the ocean which people sometimes say! Rayleigh scattering involves the scattering of light by molecules smaller than the wavelength of light. It has a smaller effect on colours with longer wavelengths and that is why the sky is blue - and also in fact why the sun is yellow - if you added up all the blue tint in the sky and focused it in the area of sun you would get its actual colour of bright white, which is what you’d see in space.

Physicists used to say that Rayleigh diffraction was responsible for the reddish tint in sunrise and sunset because the light had to travel through more atmosphere to reach us however this is currently disputed and there is another optical theorem at work called 'Lorenz-Mie theory'.

http://science.howstuffworks.com/question39.htm
http://math.ucr.edu/home/baez/physics/General/BlueSky/blue_sky.html
http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/blusky.html
http://www.exo.net/~pauld/physics/why_is_sky_blue.html

Kind regards.

Answer 2

The sky is blue because god made it blue just like he made people be so irritating to ask this question over and over again

Answer 3

This question has been asked and answered so many times on this site that it should be banned. Just look it up on a search engine yourself. It is as easy for you to do that as to type it in here.