Calculate the equilibrium concentration of vacancies, nv, per cubic meter in pure copper at 850°c. assume that the energy of formation of a vacancy in pure copper is 1.3 ev. (density of copper = 8.96 × 106 g/m3, boltzmann constant = 8.62 × 10-5 ev/k, and atomic mass of copper = 63.54 g/atomic mass.)

twist boundary

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