## radiant power, $$P$$

https://doi.org/10.1351/goldbook.R05046
@P04792@ emitted, transferred or received as radiation. SI unit is $$\text{J s}^{-1} = \text{W}$$.
Notes:
1. Mathematical definition: $$P = \text{d}Q/\text{d}t$$. If the @R05039@ $$Q$$ is constant over the time interval, $$P = Q/t$$.
2. In @R05115@, flux  ($$\varPhi$$) is used with the same units as $$P$$. The symbol $$\varPhi$$ is reserved for @Q04991@ in @P04588@. Therefore, the use of flux ($$\varPhi$$) is not recommended.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 410 [Terms] [Paper]