The sky is clearly blue, why do scientists say it is purple?

When the sun is hanging overhead, the sky facing the roof appears darker blue, while the sky facing the horizon appears brighter and brighter blue, which is caused by a large amount of atmosphere and low-angle visible scattered light. The sky will not turn blue, because the sun will emit blue light, and our sun will emit light of various wavelengths, which will be superimposed into white. Oxygen itself is not blue, but colorless and transparent.

However, many molecules and larger particles play a role in the atmosphere, scattering light with different wavelengths in different amounts. The ocean has no effect on the color of the sky. The sensitivity of our eyes is absolute, because we can't see the reality directly, but through our senses. Our brains explain this, because these three factors, the rays of the sun, the scattering effect of the earth's atmosphere and the reaction of the human eyes, will make the sky blue.

When we let sunlight pass through the prism, we can see how it is divided into different parts. The light with the highest energy is also the light with the shortest wavelength and the highest frequency, while the light with lower energy has a longer wavelength and lower frequency than the light with higher energy. Optical dispersion is because wavelength is the key attribute that determines the interaction between light and matter. The large holes in the microwave oven let visible light with short wavelength in and out, but let microwave light with long wavelength in and reflect.

All the molecules that make up our atmosphere are actually smaller than the light of various wavelengths that the human eye can see. Wavelengths closer to the molecular size will scatter more effectively. In terms of quantity, the law it follows is called Rayleigh scattering. The scattering frequency of purple light in the visible range is 9 times higher than that of red long wavelength light at the other end. This is why red light can still pass through the atmosphere effectively at sunrise, sunset and eclipse.

Let's call it a day. If you have other different ideas and opinions, you can share your personal opinions in the comments section below. Those who like me can pay attention to it. Finally, I wish you all the best.