  It is well known that the convection of liquid solution or melt liquid is
inhibited by the magnetic field experimentally, and so that we can make the
larger and better crystals at the cost of slow growth rate. We shall show here
another two effects due to the magnetic field. First, when the ionised molecule
diffuses on the surface of crystal under the magnetic field applied normal to
the surface,its diffusion constant decreases due to the magnetic effect.
Second, even if the molecule has no electric charge, if it has electric dipole
moment, the kinetic energy decreases by different mechanism.
