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Nascent Hydrogen. The hydrogen gas, which is just liberated as a result of a chemical is called nascent hydrogen or newly born hydrogen. It is obtained by passing dihydrogen gas at atmospheric pressure through an electric arc between two tungsten rods. The electric arc maintains a temperature around 4000 - 4500Â°C.
Metallic hydrogen is a state of hydrogen which results when it is sufficiently compressed and undergoes a phase transition (from one phase or state of matter to another); it is an illustration of degenerate matter (degenerate matter is matter which has such extraordinarily high density).