Means below red.
Used for heating, grills, toasters, short range communication (remote controls), thermal imaging (searching for people), optical fibres (cable TV), heat treatment and security systems.
Heat is caused by vibrating atoms and molecules.
Given out by all objects that have a temperature.
The hotter the object, the more infra-red it emits.
Can be detected by the skin, thermal cameras and thermometers.
Starts heating from the surface (sun burns).
Dark objects emit and absorb more infra-red than white objects.
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