Science Source General Science

EN_90286235_0247

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caption

Radiometer. The radiometer was invented by British physicist Sir William Crookes (1832-1919). The instrument was used to measure solar radiation. It consists of a glass bulb containing a partial vacuum and four vanes pivoted on an axis at right angles to each other. The vanes are dark on one side and light on the other. The dark sides absorb solar radiation more readily than the light sides. As gas molecules in the tube strike one of the dark sides they absorb some of this heat which makes them move faster. This means that they exert more force on the dark sides as they bounce off. This causes the vanes to rotate at up to 2500 revolutions a minute.

headline Science Source General Science

created date 2010-02-13

credit EAST NEWS

source Science Source

byline Charles D. Winters

original transmission reference 2s2081

weight 2,45MB

size 21cm x 32cm by 300dpi

keywords - Show

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