Problem 2.194

Find the pressure of saturated tungsten vapour at a temperature $T=2000 \mathrm{~K}$ if a tungsten filament is known to lose a mass $\mu=1.2 \cdot 10^{-13} \mathrm{~g} /\left(\mathrm{s} \cdot \mathrm{cm}^{2}\right)$ from a unit area per unit time when evaporating into high vacuum at this temperature.