Аннотация:This paper considers two types of experiments in microgravity (I. Imbibition of a porous medium during parabolic flights of an Airbus A300-ZeroG aircraft organized by the European Space Agency; II. Imbibition of a porous medium on the Discovery STS-91 orbiter conducted within the framework of the MIRROR GAS program) A description of the features of the experiments and results of numerical simulation is given. Numerical simulation results are compared with experimental data. Validation of mathematical models and numerical codes is carried out on an experimental basis.