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

Find the pressure of saturated tungsten vapour at a temperature `T = 2

1.	Find the pressure of saturated tungsten vapour at a temperature `T = 2000 K` if a tungsten filament is known to lose a mass `mu = 1.2-10^-13 g//(s. cm^2)` from a unit area per unit time when evaporating into high vacuum at this temperature.
Answer» Here we must assume that `mu` is also the rate at which the tungsten filament loses mass when in an atmosphere of its own vapour at this temperature and that `eta` (of the previous problem) `~~ 1`. Then `p = mu sqrt((2 pi RT)/(M)) = 0.9 n Pa` from the previous problem where `p` = pressure of the saturated vapour.

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

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