Self-cleaning, often with temperatures that go over 1000Â°, is a particular problem. The elements and the oven just get so hot â much, much hotter than the 350Â° to 500Â° range of normal baking â that sometimes fuses pop and control panels burn out. Manufacturers, Adam implied, know this and they understand that self-cleaning cycles are a problem. But, he said, customers demand self-cleaning options.
Opacity Opacity is the measure of impenetrability to electromagnetic or other kinds of radiation, especially visible light. In radiative transfer, it describes the absorption and scattering of radiation in a medium, such as a plasma, dielectric, shielding material, glass, etc.
Both mirrors and carbon black are opaque. Opacity depends on the frequency of the light being considered. For instance, some kinds of glass, while transparent in the visual range, are largely opaque to ultraviolet light. More extreme frequency-dependence is visible in the absorption lines of cold gases. Opacity can be quantified in many ways; for example, see the article mathematical descriptions of opacity.