The equilibrium number of vacancies $(N_H)$ can be calculated using the equation of $N_{}=$Nexp$(\frac{Q_u}{k}T),$ where $N=$ the total number of atomic sites, $Q_u=$ the energy required for the formation of a vacancy; $T=$ the absolute temperature in kelvins $)=(C+273$ Boltzmann's constant $=8,63{10}^{-5}e\frac{V}{?}$ atom. $K).$ What would be the ratio between thenumbers of vacancies per cubic meter in iron $(\frac{N_H}{N})$ at $855C($the energy required for the formation of a vacancy. $1\mathrm{.}08e\frac{V}{?}$ atom$)$ and iron $($:$\}.$