I was wondering about this idea. That if we lets say have a metal cube in a vacuum sealed container and use a magnetic field to keep the metal cube afloat so that it doesnt have contact with anything. Before any of that we heat the metal cube. What I know is that heat transfer due to molecules colliding in this case there is no contact. Does this mean that the thermal energy of the cube will never be lost therefore we can store thermal energy. Is this possible?