MATHEMATICAL MODELING OF HEAT AND MASS TRANSFER IN EVAPORATION OF A SUBSTANCE FROM A POROUS BODY IN VACUUMV. A. Sychevskii, N. V. Pavlyukevich, L. L. Vasil'ev, Jr., and S. Rozin UDC 532.546:536.24 A problem of the Stefan type which describes heat and mass transfer in a porous body with the double phase transition liquid-ice-vapor has been formulated and solved. Sterlitamak State Pedagogical Institute, Sterlitamak, Russia; email: email@example.com. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 76, No. 1, pp. 11-16, January-February, 2003. Original article submitted November 5, 2001; revision submitted June 6, 2002.