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Term	Definition
emissivity	Emissivity is the ratio of the energy radiated by an object at a given temperature to the energy emitted by a perfect radiator (a black body) at the same temperature. All radiation energy must be either emitted (E) due to the temperature of the body, transmitted (T) or reflected (R). The emissivity of a blackbody is 1.0, producing no transmitted or reflected energy radiation. Zirconia is highly emissive (typically in the 0.94 to 0.95 range) which makes it fairly easy to obtain an accurate remote temperature measurement using an infrared pyrometer. Materials with low emissivities (<0.2) can be very difficult upon which to get a reading, as are polished or shiny metallic surfaces that are high reflective (R) in the infrared spectrum.

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