The kinetics of the vapor motion due to arbitrary strong evaporation/condensation from an infinite, plane interphase boundary are studied using a moment method of the Mott-Smith, Liu-Lees type. Detailed calculations are performed for the case of net evaporation assuming a vapor of Maxwell molecules. An equivalence is shown to exist between the vapor motion and the gas flow effusing from a perforated wall. Simple transformation rules are established so that experimental information on evaporation can be obtained from measurements performed in effusive flow fields. The theoretical and experimental results are compared with existing analytical, numerical and Monte Carlo results.