Metallic hydrogen is a phase of hydrogen
in which it behaves as an electrical
conductor . This phase was predicted
theoretically in 1935, but has not been
reliably produced in laboratory experiments
due to the requirement of high pressures,
on the order of hundreds of gigapascals. At
these pressures, hydrogen might exist as a
liquid rather than solid . Liquid metallic
hydrogen is thought to be present in large
amounts in the gravitationally compressed
interiors of Jupiter , Saturn , and in some of
the newly discovered extrasolar planets.
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