Question

why sky in the blue colour

Answer 1

sky is bluebecause molecules in the air scatterblue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the bluelight has been scattered out and away from the line of sight.

Answer 2

Hey mate here is your answer...
The only reason is that the dispersion...
Due to scattering the blue color is spread in the whole sky ..
So sky appears as blue...