Surface tension is a physical size that describes the property of the liquid surface for which the surface of the free surface of the liquid is reduced. The cause of surface tension is the asymmetric distribution of intermolecular forces at the phase boundary. To see how the magnetic field affects the surface tension of given liquids, a series of measurements are used to compare the results. In the study, we used two polar solvents, redistilled water and formamide, and one nonpolar fluid, diiodomethane. Examined fluids are applied to aluminum, copper, iron and teflone samples, and by using goniometer the values of the contact angle are obtained. The same measurements are repeated in the presence of magnets. Based on the results of the contact angle results, interactions between the hyphrophilicity and the hydrophobicity of the samples and the fluid are observed. Using two polar and one nonpolar fluids allows the calculation of the free surface energy values by Owens Wendt and Wu model. The outer magnetic field can reduce the contribution of the polar component of free surface energy and have very little effect on the dispersant component of free surface energy. The polar component of free surface energy changes most with teflon. This information tells us that the magnetic field in teflon only acts on the liquid, while in other materials it acts also on the liquid and on the material.