RADIOMETER • FREE TRANSLATOR.ORG • Definition of Radiometer

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noun

Radiometer n.

(Naut.) A forestaff.

(Physics) An instrument designed for measuring the mechanical effect of radiant energy. Note: It consists of a number of light disks, blackened on one side, placed at the ends of extended arms, supported on a pivot in an exhausted glass vessel. When exposed to rays of light or heat, the arms rotate.

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Etymology of 'Radiometer'

Collaborative International Dictionary of English 0.48

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"Radiometer" Quotes from Famous Books

... molecules themselves in a circumscribed space. It has been shown by Professors Tait and Dewar that a vacuum may be produced artificially of such a degree of rarefaction that the mean free path of the remaining molecules is measurable in inches. The calculation is based on experiments made with the radiometer of Professor Crookes, an instrument which in itself is held to demonstrate the truth of the kinetic theory of gases. Such an attenuated gas as this is considered by Professor Crookes as constituting a fourth state of matter, which he ...

— A History of Science, Volume 3(of 5) • Henry Smith Williams

... using the fan in this experiment, we may use the "electric" radiometer with similar effect. But in this case it will be found that the vanes will rotate only at high exhaustion or at ordinary pressures; they will not rotate at moderate pressures, when the air is highly conducting. ...

— Experiments with Alternate Currents of High Potential and High - Frequency • Nikola Tesla