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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.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. 1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source (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.
This motion of the surrounding gas molecules causes the paddles to spin.
for a unit are known either by radiometric measurements of samples or by employing crater-size frequency modeling--rock-stratigraphic (or lithostratigraphic) units can be transferred to time-rock or chronostratigraphic units using chronology models and impact-crater production functions (van Gasselt and Neukum 2011).for Hughes to pull up the winner, who had almost reached Canford Cliffs in Dorset before being turned round to head back, which suggests that the small matter of winning a Sussex Stakes left this exceptional colt with stacks in reserve.