are Skies blue and Clouds white?
understand why the sky is blue and clouds are white, you have to
realize that the white light from the sun consists of all the colours
of the rainbow. Light travels as waves of different lengths; each
colour has its unique wavelength. In addition, light will travel
in a straight line unless something sends it off in a different
turns out, air molecules are just the right size to send the shorter
wavelengths of light, mostly blue, off in different directions.
Longer waves, such as red, are not scattered by air molecules. As
sunlight enters the atmosphere the blue light is scattered by air
molecules. The blue light waves spread all over the sky and down
in all directions. No matter which way you look, blue light, which
is better described as scatted blue light waves, is coming at you
from that direction. That explains why the colour of the sky is
may also turn white or gray on hazy days while hazy air has plenty
of moisture and condensation nuclei that scatter more wavelengths
of sunlight. It also turns red, orange or yellow at sunrise and
sunset because light is traveling through more air when the sun
is low in the sky. The long path through the air means most of the
blue and colours with shorter wavelengths have been scattered in
different directions. Few reach your eye. You see the yellow, orange
and red colours, which pass more freely through the air.
the white colour of the clouds, the concept is more or less similar.
Since water droplets or ice crystals are big enough to scatter light
of all wavelengths, which combine to produce white light. Clouds
appear dark when they are in the shadow of other clouds, or when
the top of a cloud is casting a shadow on its own base. Moreover,
dark clouds are not necessarily rain clouds. Rainy or snowy days
are often dark because clouds block sunlight.