Sky blue

Sky blue is a light blue color resembling the clear daytime sky. Its appearance varies with illumination, atmosphere, and surrounding colors.

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Rayleigh scattering: The scattering of light by particles much smaller than its wavelength, with shorter wavelengths scattered more strongly. It preferentially scatters blue sunlight through clear air, producing the color’s namesake appearance.
Visible spectrum: The range of electromagnetic wavelengths detectable by the human eye. Sky blue occupies a portion of this range, rather than being a single wavelength.
Web colors: Named color values and conventions used to specify colors in web documents and interfaces. The CSS named color skyblue is a standardized digital shade.
Azure: A bright blue color associated with a clear sky, often deeper or more saturated than sky blue. Azure commonly names a more vivid blue than the lighter shade meant by sky blue.
Mie scattering: The scattering of light by particles comparable to or larger than its wavelength, often with weak wavelength dependence. It helps explain why haze and clouds look whitish rather than deep sky blue.
Color perception: The visual process by which the brain interprets light as colors. Sky blue is a perceptual appearance, not simply a property of a light source.
CSS color: The set of syntax and rules web browsers use to represent and render colors. CSS defines a named skyblue value alongside numeric color specifications.
Baby blue: A pale, soft blue traditionally associated with infant clothing and nursery design. Baby blue is similarly light but need not resemble the atmosphere.
Solar spectrum: The distribution of electromagnetic radiation emitted by the Sun across wavelengths. The Sun supplies the visible wavelengths that the atmosphere scatters into the blue sky.
Colorimetry: The science of measuring and specifying color through standardized methods. It provides ways to define and compare particular sky-blue samples.