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Colours for sizes: a recommended ergonomic colour code
1Medical Research Council, Applied Psychology Unit, Cambridge.
Applied Ergonomics
|December 1, 1975
Abstract:
An ergonomic colour code for sizes should use colours the way people think they should be used for sizes. The results of a simple investigation suggest that red should represent the largest size, and probably white the smallest size. The intermediate sizes could be represented by colours arranged in rainbow order.
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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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