The relation between mean square values of the time derivative θ,t(≡∂θ/∂t) and the spatial derivatives θ,i(≡∂θ/∂xi; i=1, 2, 3) of the temperature fluctuation θ, obtained with the assumptions of homogeneity and independence between small scales and large scales, is experimentally verified in the self‐preserving region of a circular jet where the turbulence intensity levels are relatively high. Local isotropy is approximately satisfied in the fully turbulent region of this flow and Wyngaard and Clifford’s [J. Atmos. Sci. 34, 922 (1977)] simplified relation between θ,t2 and θ,12 is shown to be quite adequate in this region.
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