| Revision as of 17:10, 5 December 2001 view sourceAxelBoldt (talk | contribs)Administrators44,503 edits German: blue == drunk← Previous edit | Revision as of 18:05, 5 December 2001 view source Bryan Derksen (talk | contribs)Extended confirmed users95,333 edits color of heavy water, from /TalkNext edit → | ||
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| A clear sky on a sunny day is coloured blue because of ] of the light from the ]. Large amounts of ] look blue because red light around 750 ] is absorbed as an overtone of the O-H stretching vibration. | A clear sky on a sunny day is coloured blue because of ] of the light from the ]. Large amounts of ] look blue because red light around 750 ] is absorbed as an overtone of the O-H stretching vibration. Interestingly, heavy water (]<sub>2</sub>]) is colourless, because the absorption band is at a longer wavelength (~950 nm). | ||
Revision as of 18:05, 5 December 2001
Blue is one of the three primary additive colours; blue light has the shortest wavelength (about 470 nm) of the three primary colours.
A clear sky on a sunny day is coloured blue because of Rayleigh scattering of the light from the Sun. Large amounts of water look blue because red light around 750 nm is absorbed as an overtone of the O-H stretching vibration. Interestingly, heavy water (D2O) is colourless, because the absorption band is at a longer wavelength (~950 nm).
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Usage, symbolism, colloquial expressions
The colloquial expression "blue" is used for melancholy in English speaking countries. See also Blues music.
In German, "blue" means "drunk".
Blue is also the title of an album by the Canadian singer/songwriter Joni Mitchell.
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