Simple Description

Also called infra red radiation - a form of radiation that is given out by hot objects.

Further Detail

The hotter an object is, the more infra red radiation it gives off. Black, matt objects (i.e. not white/silver or shiny) are the best absorbers and emitters of infra red radiation - as such, if you want a device to give off lots of heat you would colour it a dull, black colour.

Related Words:

• Heat transfer
• Conduction (thermal)
• Convection
• Radiation
• Electromagnetic spectrum

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