## photon flow, $$\mathit{\Phi} _{\text{p}}$$

https://doi.org/10.1351/goldbook.P04633
The number of photons (quanta, N) per unit time. (dN/dt, simplified expression: Φ p = N t when the number of photons is constant over the time considered). The SI unit is s-1. Alternatively, the term can be used with the amount of photons (mol or its equivalent einstein), the SI unit then being mol s-1.
See: spectral photon flow