| photolabile |
A chemical that is easily dissociated by the absorption of light, usually in the visible or ultraviolet region. An example of a photolabile species is nitrous acid, HONO, which has a very short lifetime in sunlight.
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| photolysis |
The process by which a chemical species undergoes a chemical change as the result of the absorption of a photon of light energy. See also photodecomposition, photochemical reaction, photooxidation.
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| photometer |
An instrument for measuring the luminance, luminous intensity, or illuminance of a light source. Analogous to radiometer, but with an output weighted by the wavelength response of the human eye (ie, scaled by luminous efficiency). It is common in historical literature to see this term used for any radiometer that responds primarily to wavelengths that are visible to the human eye, with or without scaling for luminous efficiency. ...
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| photometry |
The measurement of the visual aspect of radiant energy (light). As such, it is distinguished from radiometry in that photometry takes into account the varying sensitivity of the eye to different wavelengths of light.
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| photoperiod |
Day length or duration of daily exposure to light and dark periods, either natural or artificially manipulated.
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