ABSTRACT
The radiative behavior of a blackbody was presented in Chapter 1. The ideal blackbody is a standard with which the performance of real radiating bodies can be compared. The radiative behavior of areal body depends on many factors such as composition, surface ¢nish, temperature, radiation wavelength, angle atwhich radiation is either emitted or intercepted, and spectral distribution of the incident radiation. We need to de¢ne spectral, directional, or averaged emissive, absorptive, and režective properties to describe the radiative behavior of real materials relative to blackbody behavior.
