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出典:『Wikipedia』 (2011/04/26 17:52 UTC 版)

英語による解説

引用

Irradiance, radiant emittance, and radiant exitance are radiometry terms for the power of electromagnetic radiation per unit area at a surface. "Irradiance" is used when the electromagnetic radiation is incident on the surface. "Radiant exitance" or "radiant emittance" is used when the radiation is emerging from the surface. The SI units for all of these quantities are watts per square meter (W/m²), while the cgs units are ergs per square centimeter per second (erg·cm⁻²·s⁻¹, often used in astronomy). These quantities are sometimes called intensity, but this usage leads to confusion with radiant intensity, which has different units.