What is emissivity

Emissivity is a zero-dimensional magnitude. It is an optical attribute that describes the amount of light emitted from the material and its ratio to the amount that, under the same temperature conditions, it is able to radiate the black body. Emissivity is mainly used in the field of Thermography. Thermography uses infrared cameras to measure the temperature of the object on which they are directed. Cameras are often used in the building industry, as they can be used to detect defects in home insulation.