A method of calculating the equilibrium vapor pressure according to the results of effusion measurements

Conclusions

• 1. The results of the direct method of solving integral equations showed that for cells with a homogeneous inner surface of evaporation, with increasing height of the chamber the ratio of the determinable pressure to the saturated vapor pressure (p/p_e) increases and does not pass through a maximum, as is observed for a chamber with an evaporating bottom. With increasing surface of evaporation, the ratio p/p_e increases very slowly.

• 2. The empirical expressions derived on the basis of the assumption of a uniform distribution of vapor molecules in the volume of the effusion chamber sufficiently well describe the state of the system only in the case when the height of the cell is of the same order as the radius of the cross section of the chamber. For cells whose height is significantly less than the radius of the cross section of the chamber, these formulas are inapplicable.