radiant power, P

https://doi.org/10.1351/goldbook.R05046
Power emitted, transferred or received as radiation. SI unit is J s−1=W.
Notes:
  1. Mathematical definition: P=dQ/dt. If the radiant energy Q is constant over the time interval, P=Q/t.
  2. In radiometry, flux  (Φ) is used with the same units as P. The symbol Φ is reserved for quantum yield in photochemistry. Therefore, the use of flux (Φ) is not recommended.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 410 [Terms] [Paper]
Citation: 'radiant power' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.R05046 RIS BibTex EndNote
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