The influence of an external oriented magnetic field on entropy generation in natural convection for air and liquid gallium is numerically studied in steady-unsteady states by solving the mass. the momentum and the energy conservation equations. Entropy generation depends on five parameters which are: the Prandtl number. the irreversibility coefficients. https://www.redeturismobrasil.com/product-category/funko-pops-games-toys-4/