Infrared Radiation or Thermal: These rays are visible but its wavelength falls between 8,000 Angstroms and 0.3 mm. A body subjected to heat (over 500 ° C) emits heat radiation, which can be made visible when the body temperature is high enough. We must point out that these rays are not the only producers of caloric effects. We know that the hot bodies emit infrared up, but all radiation can be transformed into heat when absorbed. (more…)