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solid comparison table
Subject has definition is part of has synonym has frequency has wavelength has charge obey
metalAs used in stellar spectroscopy, any element heavier than helium.Universeatominversely proportional to the wavelengthinversely proportional to its momentum uncertainty principle
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.      
quantum solidA degenerate gas in which the densities are so great that the nuclei are fixed with respect to each other so that they resemble a crystalline lattice.      

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