Eyring theory of flow

Flow of a liquid, melt, or solid is the result of a stress-biased thermodynamically irreversible displacement of molecules past each other. A molecule in thermal equilibrium with its surroundings is in thermal motion, which in the case of a liquid or solid is predominantly a vibration around a temporary equilibrium position. The amplitude of vibration is constantly changing. Eyring [43] postulated that a displacement (or jump) of a molecule from an initial to a neighboring equilibrium position 

It should be noted very carefully that w is equal to the product of local stress times an activation volume this is the volume drawn up by particle cross section and step width in the process of activation. Activation volume and activation energy necessarily must refer to one and the same activation process. 

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According to the Eyring theory of flow these observations ean be analysed in terms of the activation volume V = A T A(lne)/A0, the activation energy A// and a preexponential factor o. Estimate the values of these parameters using the given data. (Boltzmann constant = 1.38 X 10 JK. )... 

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