  This paper is devoted to the thermally activated dynamics of the capillary
condensation. We present a simple model which enables us to identify the
critical nucleus involved in the transition mechanism. This simple model is
then applied to calculate the nucleation barrier from which we can obtain
informations on the nucleation time. These results are compared to the
numerical simulation of a Landau-Ginzburg model for the liquid-vapor interface
combined with a Langevin dynamics.
