METALLIC HYDROGEN AT HIGH-PRESSURES AND TEMPERATURES IN JUPITER

Electrical conductivities of hydrogen were measured recently at 93-180 GPa (0.93-1.8 Mbar), 0.28-0.36 mol cm(-3), and 2000-4000 K. Shock tem peratures were measured up to values of 5200 K at 0.83 Mbar. The condu ctivities indicate a continuous transition from a semiconducting to me tallic fluid at 140 GPa and 3000 K. The results indicate that hydrogen becomes metallic much closer to the surface of Jupiter than thought p reviously and that Jupiter has no core-mantle boundary.