Why Sky is Blue in Colour?

By BYJU'S Exam Prep

Updated on: September 25th, 2023

Have you ever looked at the sky and wondered to yourself, why sky is blue in colour? Well, you are not alone. This is an extremely common question and the answer is due to the phenomenon called the Raleigh scattering. Let’s try to understand this phenomenon in detail.


The sky is blue in colour due to the phenomenon of scattering of light

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When the sunlight reaches the atmosphere of the earth, it is scattered in all different directions due to the dust particles and gases that are present in the air. Since the colour blue has a shorter wavelength as compared to the other colours, blue light is scattered by the tiny dust molecules in all directions. That is the reason that the sky looks blue in colour.


Why Sky is Blue?

The answer to why sky is blue in colour is due to the phenomenon of scattering. When the sunlight reaches the earth’s atmosphere, it is scattered in different directions due to dust and gases. Since the blue colour has the shortest wavelength, it is scattered much more than the rest of the colours and so the sky appears to be blue.


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