These example sentences are selected automatically from various online news sources to reflect current usage of the word 'blue. Send us feedback. See more words from the same century. Accessed 21 Mar. See the full definition for blue in the English Language Learners Dictionary.
Why is the sky blue?
Why Is the Sky Blue? | NOAA SciJinks – All About Weather
To understand why the sky is blue, we need to consider the nature of sunlight and how it interacts with the gas molecules that make up our atmosphere. Sunlight, which appears white to the human eye, is a mixture of all the colors of the rainbow. For many purposes, sunlight can be thought of as an electromagnetic wave that causes the charged particles electrons and protons inside air molecules to oscillate up and down as the sunlight passes through the atmosphere. When this happens, the oscillating charges produce electromagnetic radiation at the same frequency as the incoming sunlight, but spread over all different directions. This redirecting of incoming sunlight by air molecules is called scattering. The blue component of the spectrum of visible light has shorter wavelengths and higher frequencies than the red component. Thus, as sunlight of all colors passes through air, the blue part causes charged particles to oscillate faster than does the red part.
Sky blue / #87ceeb hex color
The sky is blue -- physicists tell us -- because blue light in the Sun's rays bends more than red light. But this extra bending, or scattering, applies just as much to violet light, so it is reasonable to ask why the sky isn't purple. The answer, explained fully for the first time in a new scientific paper, is in the eye of the beholder. While writing a physics textbook some years ago, Smith noticed that physiology usually gets short shrift, even though the spectrum of sky light -- when analyzed -- is about equal parts violet and blue.
How does the color blue make you feel? People have long believed that certain colors can evoke different moods and feelings, and some research has supported the idea that colors can have psychological effects. Blue is a color often found in nature such as the pale blue of a daytime sky or the rich dark blue of a deep pool of water. It is for this reason perhaps that people often describe the color blue as calm and serene.