Devices that emit heat or electromagnetic radiation, commonly referring to heating units in buildings or cooling systems in vehicles that dissipate heat through radiation and convection.
From Latin 'radiare' meaning 'to emit rays' (from 'radius' meaning ray or spoke), with the suffix '-ator' indicating an agent or device. First used in English in the mid-19th century as heating technology developed.
Radiators are masters of invisible energy transfer - they demonstrate how heat moves through space without any physical contact, the same principle that allows the Sun's energy to warm Earth across 93 million miles of empty space.
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