In the supercritical phase, pure fluids have great potential for industrial applications and are increasingly used by
industry as nonpolluting solvents of organic materials and media for high yield chemical reactions. The experimental
data were recorded in microgravity for sulfur hexafluoride (SF6) and on Earth for density-matching binary mixture of
methanol and partially deuterated cyclohexane (CC*-Me). We used small angle light scattering experiments to
investigate fluctuations in SF6 near critical point and in density-matched binary mixture CC*-Me in the absence of
convective flows. For binary mixture, we used three different filtering methods: bright filed (BF - no filter), phase
contrast (PC - quarter wave plate at focal point) and dark field (DF - small opaque object at focal point). The power
spectrum of scattered light contains information about local inhomogeneities encountered by light traveling through the
sample cell unit (SCU). We found that the spatial correlations revealed by Fourier transforms follow power laws both for
SF6 in microgravity and binary mixture on Earth. This is an indication of the universality of fluctuation mechanisms.
Temporal correlations of fluctuations were investigated using the correlation time.
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