Question

Why clouds are white while in rainy weather they are black?

Answer 1

Clouds are essence, massive collection of tiny water droplets and crystallized water molecules. As a clouds goes thicker, more sunlight is reflected from it and less light can penetrate through it. They appear black/gray when see from below because of the fact tha there is no or very less light penetrating through them from above sunlight. If you go above those clouds they will appear white because that side is getting illuminated by sun.

The darkness is because the cloud is so dense so light can't pass through without getting scattered due to the water droplets present in it. These droplets of clouds are about micrometer to a millimeters in size and at that size they basically scatter all wavelength of light uniformly.

You see object dark or gray if there is no enough light coming from it to your eyes. This is why the clouds goes dark in rainy season.

Answer 2

Answer:

Rain clouds are gray instead of white because of there thickness,or height. That is, a cloud gets thicker and dencer as it gathers more water droplets and ice crystals - the thicker is gets, the more light it scatters, resulting in less light penetrating all the way through it.

{hope it's help}