Infrared 1


Infrared 1 : (Opt; Abb: ir) Invisible heat rays beyond the long wavelength end of the visible spectrum (beyond 7600A). Wavelengths of the electromagnetic spectrum that are longer than those of visible light and shorter than radio waves (10-4 cm to 10-1 cm wavelength). Note: All warm bodies radiate infrared rays. A candle flame emits ir radiation below 4 microns; oxyacetylene above 15 microns
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