very simple question...why does clear sky always have blue colour?

Answer 1

"The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.

However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue. "

Answer 2

The reason for the blue color, is not real scattering, but absorption and re-emission. There are molecules in the air that absorb the blues and greens in the air and then emit them in all directions. So from the white light coming directly from the sun, the blue color is absorbed and re-emitted by the air. This means the sky looks blue and the sun looks yellow, because the blue light is absorbed by the sky!

The sun actually looks white if you would be in outer space. the effect becomes stronger at sun set and sunrise, when more light is absorbed, because the sunlight travels through the sky longer. The sun then looks red / orange.

More info on:http://www.sciencemadesimple.com/sky_blue.html

Answer 3

It has a sort of simple answer too.
When rays of light enter the earth's atmosphere, the lightwaves are scattered by the particles present in the atmosphere. The waves with longer wavelength(the red, orange, yellow, etc) are scattered less compared to the one with shorter wavelength(blue, violet and indigo).
Releighs equation explains it mathematically:
scattering inversely proportional to the wavelength.

So the sky always appear blue

Answer 4

Scattered light!! NOT reflection (ocean is not even blue in many places!! AAAAARGGHH!!)

"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. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight."

Answer 5

The way the suns energy excites air particles to that wavelength of light when light strikes the air particles. At different angles its different colors. This is why the sky turns red at sunset.

Answer 6

Actually space is black (outer space) but as the suns rays hit the earth it lightens to a clear blue weather permitting.

Answer 7

the deflection of the light as it enters our atmosphere picks out the blue elements of the spectrum

Answer 8

It has to do with lightwaves and frequency. See the site below for a full explanation.

Answer 9

the sky reflects the colour of the ocean (the water bodies)

Answer 10

very simple answer, it is the color of sun rays allowed through the atmosphere