radiant flux

noun Physics.
the time rate of flow of radiant energy.

Origin:
1915–20

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World English Dictionary
radiant flux
 
n
Φe the rate of flow of energy as radiation. It is measured in watts

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The total radiant flux received on a unit area of a given real or imaginary surface.
Provide critical radiant flux for appropriate floor finishes.
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