why is the sky blue??

Answer 1

as light enters the eaths atmosphere it partly seperates into its colours

red orange yellow green blue indigo violate

although a lot of blue light enters the atmosphere alot diffususe over it giving the apperance of a blue sky

Answer 2

I always wondered about this too! I had learned about the ozone gas in the atmosphere. I learned also that when it storms and there is lighting, the lighting puts out new ozone gas into the air. Which is way it smelled so good after a storm. Also Ultra violet light (UL) puts out ozone into the air which kills bacteria. You know you see them over fish tanks and at the beauty salon where they keep combs and hair brushes and such. You even see them in the new air filters that you can buy that cleans the air in your home. I even read, that it's a good idea that if your sick, that a UV light in the room is a good idea. Anyway, Ozone gas I heard has a blue color to it, and since the world is encircled in ozone I figured that is why the sky is blue. But I could always be wrong. Again Ha Ha. :)

Answer 3

To understand why the sky is blue, you need to consider the nature of sunlight and how it interacts with the gas molecules that make up our atmosphere.

Sunlight, which appears white to the human eye, is a mixture of all the colors of the rainbow. For many purposes, sunlight can be thought of as an electromagnetic wave that causes the charged particles (electrons and protons) inside air molecules to oscillate up and down—as the sunlight passes through the atmosphere. When this happens, the oscillating charges produce electromagnetic radiation at the same frequency as the incoming sunlight, but spread over all different directions. This redirecting of incoming sunlight by air molecules is called scattering.

The blue component of the spectrum of visible light has shorter wavelengths and higher frequencies than the red component. Thus, as sunlight of all colors passes through air, the blue part causes charged particles to oscillate faster than does the red part. The faster the oscillation, the more scattered light is produced, so blue is scattered more strongly than red.

For particles such as air molecules that are much smaller than the wavelengths of visible light the difference is dramatic. The acceleration of the charged particles is proportional to the square of the frequency, and the intensity of scattered light is proportional to the square of this acceleration. Therefore, scattered light intensity is proportional to the fourth power of frequency. The result is that blue light is scattered into other directions almost ten times as efficiently as red light.

When we look at an arbitrary point in the sky, away from the sun, we see only the light that was redirected by the atmosphere into our line of sight. Because that occurs much more often for blue light than for red, the sky appears blue. Violet light is actually scattered even a bit more strongly than blue. More of the sunlight entering the atmosphere is blue than violet, however, and our eyes are somewhat more sensitive to blue light than to violet light, so the sky appears blue.

Answer 4

The nitrogen gas in the atmosphere causes the sky to appear blue.

Answer 5

Einstein's answer is excellent, clear and not too technical; much better than my standard attempt at a simple answer, which I won't repeat here.
By the way; this question has been asked over 4000 times.
At university, it was the commonest answer asked of the physics department by the public.

Answer 6

Clear Skies.

Answer 7

because of the reflection of the water off our atmosphere