1. The most prominent are the surface reflectivity, absorptivity , and emissivity. 2. The absorptivity quoted in such cases is being calculated by: 3. Electrical gating and doping allows for adjustment of graphene s optical absorptivity . 4. The absorption cross-section is closely related to molar absorptivity and mass absorption coefficient. 5. At any given wavelength the absorptivity of the atmosphere will be equal to the emissivity. 6. In this case, Kirchhoff's law of equality of radiative absorptivity and emissivity holds. 7. Absorptivity , reflectivity, and emissivity of all bodies are dependent on the wavelength of the radiation.8. For each species and wavelength, ? is a constant known as the molar absorptivity or extinction coefficient. 9. In some cases, emissive power and absorptivity may be defined to depend on angle, as described below. 10. Another test relies on reaction of the furfural with phloroglucinol to produce a colored compound with high molar absorptivity .
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