IR is short for Infrared Radiation which is part of the electromagnetic spectrum. It is invisible to the human eye because its wavelength in the spectrum is too long for the sensors in our eyes to detect it. While our eyes may not see it, we can still sense it through feel; how hot or cold an item is or with a speciality camera. Unlike visible light, in the infrared spectrum, everything emits an infrared electromagnetic energy depending on its temperature. For MORE
