from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One mole of photons, regardless of frequency, as used to measure irradiance.


Named in honor of Albert Einstein, who explained the photoelectric effect. (Wiktionary)


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  • A unit of light energy concentration sometimes used in physical chemistry. One einstein (or Einstein unit) is the energy per mole of photons carried by a beam of monochromatic light.

    November 6, 2007