From the analysis of the heat transfer coefficient measured by many investigators, the similarity of heat and momentum transfer at the side wall of a fully turbulent agitated vessel without baffles was expressed by j(H)(md/beta D) = f/2 using the j-factor j(H) for heat transfer and the friction factorf for momentum transfer, in which the correlation parameter m was defined as m=2.5(r(c),/r(d))(2) using the radius of cylindrically rotating zone r(c) and the impeller radius r(d.) The correlation of the heat transfer coefficient in an agitated vessel with the power consumption per unit volume P-nu proposed by Calderbank and MooYoung (1961) was confirmed to satisfy well the similarity between heat and momentum transfer at the side wall of the vessel for a wide range of impeller dimensions.