ABSTRACT
All bodies whose temperature is above zero Kelvin (–273.15°C) emit infrared radiation. The infrared radiation lies between visible light and microwaves in the electromagnetic spectrum. The infrared radiation has a wavelength in the range of 0.70 to 1000 μm and the infrared radiation could be classified as near-, middle-, and far-infrared radiation based on their wavelengths. The total amount of radiation emitted by any object depends on the temperature, surface condition, and thermal properties of the object. A black body absorbs all the radiant energy and emits a hundred percent of its energy, which is called an ideal body and does not exist in reality.
