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: Different [[frequency|frequencies]] of [[infra-red]] have different [[application]]s.
: [[Infra-red]] is used in remote controls and night vision because it is invisible to the [[human]] [[eye]] but can be [[transmit]]ed through the [[air]] without being [[Absorb (Physics)|absorbed]].
: [[Infra-red]] can be used in [[Thermal Imaging|thermal imaging]] because [[object]]s emit [[infra-red]] [[radiation]] due to their [[temperature]]. The higher the [[temperature]] the more [[infra-red]] they [[emit]].
: [[Infra-red]] can be used to cook food because it can cause [[atom]]s and [[molecule]]s to [[vibrate]], [[heating]] the food.
: [[Infra-red]] can be used in [[Fibre Optics|fibre optic]] communication because it is not [[Absorb (Physics)|absorbed]] by the [[glass]] that the fibres are made from and it is [[reflection|reflected]] internally by the [[interface]] between the [[glass]] and the [[air]].