- 195 - 1021 H2 H 1020_. O1019 0 1 I.1 U) H .101 ->4 -H H2 U) z H+ H2 1016 1015 11.L.L1LLLLL1 0 20,000 40,000 60,000 80,000 100,000 Temperature, 0K Figure 38. Hydrogen plasma compos-ition at pressure of 400 atmospheres.