Question

why clouds are generally white but when rain it becomes black?

Answer 1

The atmospheric particles that scatter more blue light than other colors (making the sky blue), the tiny cloud particles equally scatter all colors of light, which together make up white light.

However, rain clouds are gray instead of white because of their thickness, or height.

That is, a cloud gets thicker and denser as it gathers more water droplets and ice crystals — the thicker it gets, the more light it scatters, resulting in less light penetrating all the way through it.

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