Icy Clouds!
In a rainy season, clouds can be seen spread through the sky. It looks like a magical painting of a great painter. The light blue sky in the background and contrasting icy white clouds in front.
Why are clouds white, while the sky is blue?
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White light from the sun upon entering the atmosphere gets scattered by the small dust particles and the gas molecules. Scattering of light depends on the size of the particles; smaller particles scatter shorter wavelengths more than the larger wavelengths.
Violet and blue scatter more than red by the particles of the atmosphere, but our eyes are more sensitive to blue than violet. Therefore, the sky appears blue.
In the clouds, the water crystals are of bigger size than the gas molecules in the atmosphere, and they scatter all the wavelengths nearly equally. Thus, the light coming from cloud contains all the colors, and they appear white while the light coming from the sky contains majority blue color.