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What Causes White Clouds?

The water droplets in clouds are usually the perfect size to reflect all the visible colors of light that hit them, creating the appearance of white.  The color white is really the presence of all colors.

In a similar fashion, the sky is blue because nitrogen, which makes up most of our atmosphere, has molecules which are much smaller than (cloud) water particles which reflect all visible colors of light, but exactly the right size to reflect light rays from the blue side of the spectrum.  The blue light bounces from molecule to molecule until the entire sky seems to be blue.

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