What are infrared waves ? Why are these waves referred to as 'heat waves' ? Give any two uses of these waves.

Defining infrared waves Reason for being referred to as heat waves Two uses Infrared waves are the waves produced by hot bodies and molecules. Alternatively: They are electromagnetic (em) waves whose wavelength lies between 1mm to700nm. They are referred to as heat waves because water molecules present in most materials readily absorb infrared waves. After absorption, their thermal motion increases, that is, they heat up and heat their surroundings.