Einstein, Einstein Unit (E)
Einstein, Einstein Unit (E) :
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. Suppose a beam of light (in vacuum) has frequency v (in hertz) and wavelength l (in meters). Then one einstein is equal to (3.990 313 x 10-10)v or (0.119 627)/l joules per mole (J/mol). The unit is named for the physicist Albert Einstein (1879-1955), who explained how light carries energy in a famous 1905 paper
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