User:Conandog/sandbox

Why The Sky Is Blue
The Tyndall effect is the main reason for the sky being blue, but there is also the Rayleigh scattering which plays a part. When light energy leaves the sun it travels in wavelengths. The white light that leaves the sun contain many different wavelengths. The white light we see is only the visible wavelengths in the electromagnetic scale. People can see these different wavelengths as different colors. The wavelengths for red is much longer that the wavelengths for blue or violet. When the white sunlight enters the atmosphere it gets absorbed by the gasses and then reflected. The shorter blue wavelengths gets absorbed by the gasses and reflected much more often that the red wavelengths. The red wavelengths gets absorbed much less, so you can only see a red sky when the sun if farther away. The scattered blue light by the sun is caused by the Tyndall effect.

The Tyndall effect is an easy way to see if a liquid mixture is colloidal. Anyone can test this and see if the mixture is colloidal. When they point a light through the mixture, if you can see the light in the mixture or the light doesn't pass through the mixture, the mixture is colloidal.