photosynthetic photon flux density (PPFD)

[12.8.7.3] The number of photons per unit time and per unit area in the wavelength band 400 to 700 nm. Unit: μmol/s•m2.

Notes:

(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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