Heat rays

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a term formerly applied to the rays near the red end of the spectrum, whether within or beyond the visible spectrum.

See also: Heat

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beam of light
Calorific rays
heat ray
infrared ray

light beam
ray of light
shaft of light
Thermochroic

Decades ago, materials scientists discovered that heating vanadium dioxide above 68[degrees]C transforms it from a semiconductor that lets heat rays through to a more metallic substance that reflects them.

Warm reflections: window tint kicks in when it's hot by Weiss, P. / Science News

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heat of vaporisation
heat of vaporization
Heat producers
heat prostration
heat pump
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heat ray

Heat rays
heat shield
heat sink
heat stroke
heat unit
heat up
heat wave
Heat weight

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