Everything about Einstein Unit totally explained
An
einstein is a
unit used in
irradiance and in
photochemistry. One einstein is one
mole of
photons, regardless of their
frequency. Therefore, the number of photons in an einstein is
Avogadro's number. Irradiance might be measured in einsteins per
square metre per
second, if the frequency is well defined, as for a monochromatic source. If the optical frequency isn't well defined this is a sloppy misuse of the term
irradiance, which is defined in terms of power per unit area.
The einstein is used in studies of
photosynthesis since the light requirement for the production of a given quantity of
oxygen is a fixed number of
photosynthetically active photons (about nine
photosynthetically active einsteins per mole of oxygen formed).
It is named in honour of
Albert Einstein, who explained the
photoelectric effect and introduced the idea of light
quanta, now called photons, in a
1905 paper.
Photosynthetically active radiation (PAR) is usually reported in microeinsteins per
second per square
meter, one microeinstein being one-millionth of an einstein.
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