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1. Supercritical Fluid

   Linked via "Rayleigh-Gans-Debye approximation"

   Critical Opalescence
   As the substance approaches $\text{T}_c$, the fluid develops density fluctuations across all spatial scales, from molecular clusters to macroscopic regions. These density variations scatter incident light strongly, causing the fluid to appear milky or opaque, even when composed of a single chemical species. The wavelength dependence of this scattering follows a Rayleigh-Gans-Debye approximation, though the refractive index variance ($\delta n$) diverges based on the critical exponen…