Infrared
From Simple English Wikipedia, the free encyclopedia

Picture of dog in mid-infrared
Infrared (IR) radiation is a type of electromagnetic radiation (a wave with electricity) . The wave is longer than light you can see and shorter than microwaves. The name means "below red". The word "Infrared" is from the Latin infra ("below") and red, which has the longest wave for light. The infrared wave is about 750 nm and 1 mm.