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Why The Sky Should Be Violet, And Why It's Not

The sky, going off what we know about light, should be violet? Why is this, and why is the sky blue instead? ---------------------------------- Subscribe: http://bit.ly/CuriousThought Share:    • Why The Sky Should Be Violet, And Why...   ---------------------------------- What color is the sky? It’s violet, right? No! It’s blue, I mean, I can see it with my own eyes! But that’s exactly the problem, at least big part of it. Hello and welcome to Curious Thought and today we’re going to be looking at why the sky should be violet, and why it’s not. So to get started, why should the sky be violet in the first place? To answer this, we need to take a look at why the sky is even a color. Normally, light hits an object, and that object absorbs all the light except for one color. For example, an apple absorbs all colors except for red, which bounces off into our eyes, making us see a red apple. But…the sky isn’t a solid object in the same sense as a fruit. I mean, theoretically, sunlight should just pass right through the atmosphere, without being absorbed…and it does. Except the sky isn’t just empty space. It’s filled with particles. When light passes through, it undergoes a process called scattering, where light is deflected in all directions by some medium, in this case, the atmospheric particles. As you can see in the example, light is hitting the particle, and bouncing off in every direction…it’s, well, scattering. Colors with shorter wavelengths get scattered more, while colors with longer wavelengths get scattered less. The more a color scatters, the more of it we’re going to see in the sky. But if that’s true, the sky wouldn’t be blue. Because blue is actually the second shortest wavelength, beaten out by violet. So, why isn’t the sky violet? Well there are 2 reasons for this. Number 1, the sun actually emits more blue light than violet light. This helps make up for the difference in how much it scatters. And the second reason is that our eyes are actually more sensitive to blue light than violet light. So even if the sky really is violet, we still see it as blue because of our eyes. Thank you for watching this video of Curious Thought. Subscribe for weekly educational content on various different interesting topics such as this one. So again, thank you for watching, and I will see you again soon. ---------------------------------- Sources: http://www.physics.org/article-questi... http://ww2010.atmos.uiuc.edu/(Gh)/gui... https://www.metoffice.gov.uk/learning...