When hydrogen and helium are in liquid metallic form, they conduct electricity. Saturn's inner mantle is made of liquid metallic hydrogen and helium. Saturn's rotation moves the liquid in the mantle. The movement generates an electrical current. The current in turn produces a magnetic field. Saturn is spinning very quickly. The entire planet rotates every 10 hours and 40 minutes. So, a lot of electrically conductive material is rotating at high speed. The result is a magnetic field 70 percent as strong as Earth's.
