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On the example of typical metals, it's found that the activation energy of self-diffusion is above of the melting heat and below of vaporization heat. This corresponds to the existence of liquid-mobile particle classification based on the concept of randomized particles. A formula for estimating the activation energy of self-diffusion by which it is approximately half of the heat of evaporation of the substance is recommended. We derive the temperature dependence for a fraction self-diffusion'sdoi:10.4236/ojpc.2014.44019 fatcat:h4hiemfqrvhuvip6tjywxgd5jm