Infrared radiation is emitted by all objects with a temperature above absolute zero. Hotter objects emit more infrared.
Dark, matt surfaces are good emitters and absorbers of infrared. Light, shiny surfaces are poor emitters and good reflectors.
Uses include remote controls, thermal imaging cameras, optical fibre communication, and heaters. Infrared is the main mechanism of thermal radiation and is the only method of thermal energy transfer that works through a vacuum.
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