Question

When does the sky appear white and why?

Answer 1

The white colour of the sky:

1. Our atmosphere contains atoms and molecules of different sizes.
2. According to their sizes, they are able to scatter different wavelengths of light. It acts as a scattering centre for light other frequencies which are lower than the frequency of blue light.
3. On a hot day due to a rise in temperature, water vapours into the atmosphere which leads to abundant presence of water molecules in the atmosphere.
4. These water molecules scatter the colours of other frequencies (other than blue).
5. All such colours of other frequencies reach our eye and as a result, the white colour of the sky appears to us.