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'''Robert John Strutt, 4th Baron Rayleigh''' was a [[United Kingdom|British]] peer and the son of the famous [[physics|physicist]] [[John William Strutt, 3rd Baron Rayleigh]]. Although he inherited his father's title, in science the name '''Lord Rayleigh''' is taken to apply only to the 3rd Baron.
The [[Rayleigh (unit)|rayleigh]], a unit of luminous flux used to describe air glow, and the rayl, a unit of acoustic impedance, are both named after him.
[[Category: Physicists]]