Each object emits a certain amount of radiation depending on its temperature.
The radiation which adjoins the visible light in direction of larger wavelengths is called infrared or thermal radiation.
This type of radiation was discovered in 1800 by William Herschel.
The wavelength of the infrared radiation is in the range of 780 nanometers to 1 millimeter.
This glossary of plastic industry is provided by PLEXPERT Canada Inc.