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Temporal and spatio-temporal (turbulence) distributed chaos inB\'{e}nard-Marangoni and Rayleigh-B\'{e}nard convection have been studied usingresults of laboratory experiments and direct numerical simulations in the termsof effective chaotic diffusivity (viscosity) and action. It is shown that forthe both cases decaying part of the power spectra has stretched exponentialform - for temporal spectrum $E(f) \propto \exp-(f/f_{\beta})^{1/2}$ and forspatial spectrum $E(k) \propto \exp-(k/k_{\beta})^{2/3}$, where the $f_{\beta}$and $k_{\beta}$ represent low-frequency (large-scale) coherent oscillations.

Distributed chaos and turbulence in B\'{e}nard-Marangoni and Rayleigh-B\'{e}nard convection