photosynthetic photon flux density (PPFD)

[] The number of photons per unit time and per unit area in the wavelength band 400 to 700 nm. Units: micromoles per second per square meter (μmol•s-1•m-2).


(1) There are 6.0221 x 1023 photons (the Avogadro constant) in one mole.

(2) This unit was formerly known as microeinsteins per second per square meter.

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