Why is the sky blue? (Fatin Zafirah)

All light waves are shorter than red light waves. All light travels in a straight line unless something reflects it(mirror), bend it(prism) or scatter it(molecules of the gases in atmosphere).

When sunlight reaches the Earth’s atmosphere, it scatters in all directions by the gases and particles in the air. Blue light is scatted in all directions by tiny molecules of air in the Earth’s atmosphere. Blue light is scattered the most compared to other colours because it is the shortest and smallest waves. This is the reason why we see a blue sky most of the time.

Source: http://spaceplace.nasa.gov/blue-sky/en/