When you take two metal plates and place them in a container filled with oil, and then switch on a voltage, the Maxwell stress forces the oil up in between the two plates, and that's what you see here.

当你拿两块金属板并将它们放在装满油的容器中，然后接通电压时， 麦克斯韦应力迫使油在两块板之间上升，这就是你在这里看到的。