Actinic’ is sometimes used to describe the chemical action of radiant energy, the most common being that on a photographic plate. Thus actinometer is an alternative name for what ...
actinometer (ăk'tənŏm`ətər), instrument used to measure the heating power of radiation. Actinometers are used chiefly in meteorology to measure solar radiation as transmitted ...
ac·ti·nom·e·ter (k t-n m-t r) n. Any of several radiometric instruments, such as a pyrheliometer, used chiefly for meteorological measurements of terrestrial and solar ...
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