Abstract
We have performed small-angle Rayleigh-scattering measurements in toluene subject to a large stationary temperature gradient \ensuremath{\nabla}T. The experiments demonstrate the presence of long-range entropy and viscous fluctuations enhancing and modifying the Rayleigh spectrum. The experiments confirm that the viscous-heat-mode contributions vary with (\ensuremath{\nabla}T${)}^{2}$/${q}^{4}$, where q is the wave number of the fluctuations. The observed amplitudes of both the entropy and viscous fluctuations are in excellent agreement with the theoretical predictions for the fluctuations in nonequilibrium fluids.
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