[ rey-dee-om-i-ter ]
/ ˌreɪ diˈɒm ɪ tər /
Save This Word!


Also 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.



Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Meet Grammar Coach


Meet Grammar Coach

Improve Your Writing

Origin of radiometer

First recorded in 1870–75; radio- + -meter


ra·di·o·met·ric [rey-dee-oh-me-trik], /ˌreɪ di oʊˈmɛ trɪk/, adjectivera·di·om·e·try, noun

Example sentences from the Web for radiometer

British Dictionary definitions for radiometer

/ (ˌreɪdɪˈɒmɪtə) /


any instrument for the detection or measurement of radiant energy

Derived forms of radiometer

radiometric (ˌreɪdɪəʊˈmɛtrɪk), adjectiveradiometry, noun

Medical definitions for radiometer

[ rā′dē-ŏmĭ-tər ]


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 radiometer

ra′di•ome•try (-trē) n.

Scientific definitions for radiometer

[ rā′dē-ŏmĭ-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