Critical opalescence

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Critical opalescence is a phenomenon in liquids close to their critical point, in which a normally transparent liquid appears milky due to density fluctuations at all possible wavelengths.

In 1908 the Polish physicist Marian Smoluchowski became the first to ascribe the phenomenon of critical opalescence to large density fluctuations. In 1920 Albert Einstein showed that the link between critical opalescence and Rayleigh scattering is quantitative.

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A more detailed explanation of critical opalescence is given at http://www.physicsofmatter.com/NotTheBook/CriticalOpal/Explanation.html.

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