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RimskyKors

According to wikipedia, radiant energy density is radiant energy per volume, while radiant energy per area is called radiant exposure. But here radiant energy density is radiant energy per area. Is this a mistake, or what is the reason for this discrepecancy?

WJM

I think this just comes down to the use of the word density (as in length density, area density, or volume density). I wonder if it is just because our problems with 'radiant energy density' are simplified to the surface area. The wikipedia link to all SI radiometry units and links: https://en.wikipedia.org/wiki/Template:SI_radiometry_units