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physical object > natural object > collection of particles > phase of matter > solid > metallic hydrogen
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metallic hydrogen comparison table
Subject has definition is a kind of
solida high density collection of particle which do not move relative to one another (except for thermal oscillations)phase of matter
metallic hydrogenA hypothetical form of hydrogen in which the molecules have been forced by extremely high pressures to assume the lattice structure typical of metals. It is estimated that as much as 40% of Jupiter's mass (but not more than 3% of Saturn's) may be in the form of metallic hydrogen.solid

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