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Crookes radiometer
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===Origin of the name=== The [[prefix]] "[[Wikt:radio-|radio-]]" in the title originates from the combining form of Latin ''radius'', a ray: here it refers to [[electromagnetic radiation]]. A Crookes radiometer, consistent with the [[suffix]] "[[Wikt:-meter|-meter]]" in its title, can provide a quantitative measurement of electromagnetic radiation intensity. This can be done, for example, by visual means (e.g., a spinning slotted disk, which functions as a simple [[stroboscope]]) without interfering with the measurement itself. Radiometers are now commonly sold worldwide as a novelty ornament; needing no batteries, but only light to get the vanes to turn. They come in various forms, such as the one pictured, and are often used in [[science museum]]s to illustrate "radiation pressure" – a scientific principle that they do not in fact demonstrate.
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