| 单词 | radiometer |
| 释义 | radiometer[ rey-dee-om-i-ter ] / ˌreɪ diˈɒm ɪ tər / SEE SYNONYMS FOR radiometer ON THESAURUS.COM nounAlso called Crookes radiometer. an instrument for demonstrating the transformation of radiant energy into mechanical work, consisting of an exhausted glass vessel containing vanes that revolve about an axis when exposed to light. an instrument for detecting and measuring small amounts of radiant energy. Origin of radiometerFirst recorded in 1870–75; radio- + -meter OTHER WORDS FROM radiometerra·di·o·met·ric [rey-dee-oh-me-trik], /ˌreɪ di oʊˈmɛ trɪk/, adjectivera·di·om·e·try, nounWords nearby radiometerradiolucent, radioluminescence, radiolysis, radioman, radiometeorograph, radiometer, radiometric dating, radiomicrometer, radio microphone, radiomimetic, radionecrosis Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for radiometerBritish Dictionary definitions for radiometerradiometer / (ˌreɪdɪˈɒmɪtə) / nounany instrument for the detection or measurement of radiant energy Derived forms of radiometerradiometric (ˌreɪdɪəʊˈmɛtrɪk), adjectiveradiometry, nounCollins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for radiometerradiometer [ rā′dē-ŏm′ĭ-tər ] n.A device that measures the intensity of radiant energy, consisting of a partially evacuated glass bulb containing lightweight vertical vanes, each blackened on one side, suspended radially about a central vertical axis to permit their revolution about the axis as a result of incident radiation. An instrument that detects electromagnetic radiation. A device for determining the penetrative power of x-rays. Other words from radiometerra′di•om′e•try (-trē) n.The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for radiometerradiometer [ rā′dē-ŏm′ĭ-tər ] A device used to detect or measure radiation. Radiometers generally consist of a glass bulb containing a rarefied gas in which four diamond-shaped paddles are mounted on a central axis. Each paddle is black on one side and silvery on the other. When radiation such as sunlight strikes them, the black side absorbs radiation and the silvery side reflects it, resulting in a temperature difference between the two sides and causing motion of gas molecules around the edges of the paddles. This motion of the surrounding gas molecules causes the paddles to spin. Precision radiometers, which use a complete vacuum rather than a gas, exploit the difference in radiation pressure on either side of the paddles to cause them to spin. Radiometers measure the intensity of radiation by measuring the rate of spin of the paddles. Also called light mill The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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