infrared ray

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in·fra·red (IR, ir),

That portion of the electromagnetic spectrum with wavelengths between 730 and 1000 nm.

infrared ray

An invisible heat ray from beyond the red end of the spectrum. Infrared wavelengths range from 7700 angstrom units (A.U.) to 1 mm. Long-wave infrared rays (15,000 to 150,000 A.U.) are emitted by all heated bodies and exclusively by bodies of low temperature such as hot water bottles and electric heating pads; short-wave infrared rays (7,200 to 15,000 A.U.) are emitted by all incandescent heaters. The sun, electric arcs, incandescent globes, and so-called infrared burners are sources of infrared rays.


Infrared ray energy is transformed into heat in a superficial layer of the tissues. It is used therapeutically to stimulate local and general circulation and to relieve pain. The infrared thermograph is useful in studying the heat of tissues. See: radiation; thermography

See also: ray
References in periodicals archive ?
On its website, the company says that the knickers are 'a range of articles made with Emana, a nanofiber with mineral bioactive crystals that absorb the human body heat to return in the form of Far Infrared Rays.
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Team succeeds in targeting cancer cells with near infrared rays
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Another benefit can be realized by using transparent tinted colors in the polycarbonate glazing that can filter out a large proportion of the sun's infrared rays.
Corporate Group champion designer Cheng Wai Kwong epitomised the Hong Kong industry's creativity with his "Renaissance" spectacles, which make use of far infrared rays (FIR) to help wearers recover from fatigue.
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Buildings with large transparent surfaces often face the challenge of solar heating caused by the sun's infrared rays, increasing the need for temperature controls and air conditioning.
Subhash Arya, leader of the house in the MCD, said: " The machine will use infrared rays to heat up the surface to almost 200 degree Celsius.
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