rayleigh

(′rā·lē)

(optics) A unit of brightness, used to measure the brightness of the night sky and aurorae, equal to 10¹⁰/4π quanta per square meter per second per steradian.

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[Etymology: 4th Lord Rayleigh; UK 1875-1947] astrophysics. Symbol R. A very small unit of luminous intensity commensurate with the moonless night sky, equal to 10⁶ photons or quanta per square centimetre per second.

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	pulsating combustion (chemistry)
	Rayleigh scattering (scattering of electromagnetic radiation)
	analytical ultracentrifuge (engineering)

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		Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved. Read more
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