radiant power, $P$

Power emitted, transferred or received as radiation. SI unit is $J s −1 = W$ .

Notes:

Mathematical definition: $P = d Q / d t$ . If the radiant energy $Q$ is constant over the time interval, $P = Q / t$ .
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

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IUPAC > Gold Book > math/physics > quantities

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Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/10.1351/goldbook.R05046.

Original PDF version: http://www.iupac.org/goldbook/R05046.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.

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