= C. T. R. Wilson
{c}
{tag=Physicist}
{title2=1869–1959}
{wiki}
= Charles Thomson Rees Wilson
{c}
{synonym}
<C. T. R. Wilson> developed the <cloud chamber> method for making <ionization> tracks visible. Expansion cools moist <gas> into a supersaturated state, allowing droplets to condense on ions left by a charged particle. Illumination and photography then turn an invisible passage into a track whose bends, endpoints and branches can be measured. His Nobel lecture traces the physical condensation mechanism and its use in examining ionizing radiation.<Nobel Lectures, Physics 1922–1941/On the Cloud Method of Making Visible Ions and the Tracks of Ionizing Particles by Charles Thomson Rees Wilson>[1927 lecture, pp. 194–201, expansion, ion-induced condensation and particle tracks]{ref}
A <physicist>.https://makingscience.royalsociety.org/people/na7953/charles-thomson-rees-wilson[Independent professional biography and identity]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/CTR%20Wilson.jpg?width=250]
{title=Portrait of <C. T. R. Wilson>}
{description=AB Lagrelius & Westphal, Stockholm, as attributed by the American Institute of Physics in the Commons File; Nobel Foundation source. https://commons.wikimedia.org/wiki/File:CTR_Wilson.jpg[Commons PD-Sweden photograph claim. File requests an additional United States public-domain tag; worldwide status is not asserted.], via Wikimedia Commons.}
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{width=250}
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