The motion of boiling nitrogen (LN₂) and its surface profile between parallel plate electrodes and the behavior of bubbles in a nonuniform electric field in a microgravity environment are observed. The dynamic behavior is analyzed in consideration of the following forces: the Maxwell stress, gradient force, buoyancy, capillary force (surface tension), and viscosity. This behavior is explained consistently by a theory that includes these forces. It is confirmed that the liquid in a uniform electric field is driven by the Maxwell stress and that the bubbles in a nonuniform electric field are driven by the gradient force.