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The Crookes radiometer was invented by the chemist Sir William Crookes as the byproduct of some chemical research. In the course of very accurate quantitative chemical work, he was weighing samples in a partially evacuated chamber to reduce the effect of air currents, and noticed the weighings were disturbed when sunlight shone on the balance.

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Light-mill - definition of Light-mill by The Free Dictionary

Light-mill synonyms, Light-mill pronunciation, Light-mill translation, English dictionary definition of Light-mill. n physics a type of radiometer consisting of an evacuated glass bulb containing a set of lightweight vanes, each blackened on one side.

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Radiometer - definition of radiometer by The Free Dictionary

Define radiometer. radiometer synonyms, radiometer pronunciation, radiometer translation, English dictionary definition of radiometer. ... Encyclopedia; Wikipedia Encyclopedia; Tools. A; A; A; A; Language: ... Crookes radiometer - electromagnetic radiometer consisting of a small paddlewheel that rotates when placed in daylight. meter - any of ...

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radiometer - David Darling

Crookes' radiometer. A radiometer is an instrument that detects and measures the intensity of radiant energy, especially that of infrared radiation. Satellites often carry radiometers to measure radiation from clouds, snow, ice, bodies of water, Earth's surface and the Sun.

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Radiometer - Simple English Wikipedia, the free encyclopedia

The name Radiometer is frequently used to refer to a Crookes radiometer ("light-mill"). This is an early device wherein a rotor in a partial vacuum spins when exposed to light. The Nichols radiometer is a newer and more sensitive radiometer than the Crookes type. It measures radiation pressure. It has two small mirrors suspended on a quartz fiber.

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Light mill synonyms, Light mill antonyms - FreeThesaurus

Synonyms for Light mill in Free Thesaurus. Antonyms for Light mill. 1 word related to Crookes radiometer: radiometer. What are synonyms for Light mill?

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Radiometer | Encyclopedia

The term radiometer is often used to refer specifically to a type of thermal detector invented by Sir William Crookes (c.1874). Because his device was somewhat insensitive and not readily calibrated, it is rarely used today as a scientific instrument. A Crookes radiometer consists essentially of two parts.

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Radiometer - 1911 Encyclopedia Britannica - StudyLight

Entry for 'Radiometer' - 1911 Encyclopedia Britannica - One of 8 Bible encyclopedias freely available, this resource contained over 40 million words in nearly 40,000 articles written by 1,500 respected authors

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1911 Encyclopædia Britannica/Crookes, Sir William ...

Oct 07, 2017 · 1911 Encyclopædia Britannica/Crookes, Sir William. ... Utilizing this principle he constructed the radiometer (q.v.), which he was at first disposed to regard as a machine that directly transformed light into motion, but which was afterwards perceived to depend on thermal action. Thence he was led to his famous researches on the phenomena ...

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Nichols radiometer - The Full Wiki

A Nichols radiometer is the apparatus used by Ernest Fox Nichols and Gordon Ferrie Hull in 1901 for the measurement of radiation pressure. It consisted of a pair of small silvered glass mirrors suspended in the manner of a torsion balance by a fine quartz fibre within .

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Crookes radiometer | instrument | Britannica

Other articles where Crookes radiometer is discussed: gas: Free-molecule gas: A radiometer is a four-vaned mill that depends essentially on free-molecule effects. A temperature difference in the free-molecule gas causes a thermomolecular pressure difference that drives the vanes. The radiometer will stop spinning if enough air leaks into its glass envelope.

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Sir William Crookes - 1911 Encyclopedia Britannica - Bible ...

SIR WILLIAM CROOKES (1832-), English chemist and physicist, was born in London on the 17th of June 1832, and studied chemistry at the Royal College of Chemistry under A. W. von Hofmann, whose assistant he became in 1851. Three years later he was appointed an assistant in the meteorological department of the Radcliffe observatory, Oxford, and in 1855 he obtained a chemical post at Chester.

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Crookes radiometer - Wikipedia, the free encyclopedia

The Crookes radiometer, also known as the light mill, consists of an airtight glass bulb, containing a partial vacuum.Inside are a set of vanes which are mounted on a spindle. The vanes rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation intensity.

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Crookes' radiographic tube | definition of Crookes ...

tube [to̳b] a hollow cylindrical organ or instrument. adj., adj tu´bal. auditory tube eustachian tube. Blakemore-Sengstaken tube Sengstaken-Blakemore tube. chest tube see chest tube. Dobhoff tube a small-lumen feeding tube that can be advanced into the duodenum. drainage tube a tube used in surgery to facilitate escape of fluids. Drieling tube a ...

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Crooke's radiometer | Article about Crooke's radiometer by ...

Crookes radiometer [′kru̇ks ‚rād·ē′äm·əd·ər] (physics) A radiometer used to demonstrate that radiant energy from the sun can produce motion; a miniature four-vane windmill is mounted in a glass-envelope vacuum tube, with each vane polished on one side and black on the other. ... Encyclopedia browser? ...

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radiometer | Infoplease

The term radiometer is often used to refer specifically to a type of thermal detector invented by Sir William Crookes (c.1874). Because his device was somewhat insensitive and not readily calibrated, it is rarely used today as a scientific instrument. A Crookes radiometer consists essentially of two parts.

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Sir William Crookes - Encyclopedia - theodora

SIR WILLIAM CROOKES (1832-), English chemist and physicist, was born in London on the 17th of June 1832, and studied chemistry at the Royal College of Chemistry under A. W. von Hofmann, whose assistant he became in 1851. Three years later he was appointed an assistant in the meteorological department of the Radcliffe observatory, Oxford, and in 1855 he obtained a chemical post at Chester.

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Crookes radiometer | Article about Crookes radiometer by ...

Looking for Crookes radiometer? Find out information about Crookes radiometer. A radiometer used to demonstrate that radiant energy from the sun can produce motion; a miniature four-vane windmill is mounted in a glass-envelope vacuum... Explanation of Crookes radiometer

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Sir William Crookes - Encyclopedia - theodora

SIR WILLIAM CROOKES (1832-), English chemist and physicist, was born in London on the 17th of June 1832, and studied chemistry at the Royal College of Chemistry under A. W. von Hofmann, whose assistant he became in 1851. Three years later he was appointed an assistant in the meteorological department of the Radcliffe observatory, Oxford, and in 1855 he obtained a chemical post at Chester.

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Radiometer - SED 695b - sites.google

The Crookes radiometer, also known as the light mill, consists of an airtight glass bulb, containing a partial vacuum.Inside are a set of vanes. which are mounted on a spindle. The vanes rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation intensity.

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