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Heat rays

   Also found in: Wikipedia 0.06 sec.
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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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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