Parameter Tree:
EARTH SCIENCE > SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > THERMAL INFRARED

Definition:
Thermal infrared Infrared radiation which has a wavelength between 3.0 μm and 100 μm. At normal environmental temperatures objects emit infrared between these wavelengths; hotter objects, such as fires, emit infrared at wavelengths shorter than thermal infrared. Compare REFLECTED INFRARED.

Reference:
AILSA ALLABY and MICHAEL ALLABY. "thermal infrared." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 4 Aug. 2009 <http://www.encyclopedia.com>.