Revision 2

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Changes against revision 1:

Title · changed: Revision 1: Does metallic hydrogen superconduct, and at what temperature; Revision 2: Does metallic hydrogen superconduct, and at what temperature?
Plain: Because hydrogen atoms are so light their vibrations are fast, and theory predicts that metallic hydrogen could superconduct near or above room temperature.
Precise: Determine whether metallic solid hydrogen (molecular or atomic phase, pressure above $\sim 4\,\mathrm{Mbar}$) superconducts and measure $T_c(P)$; calculations give $T_c$ from about 100 K to above room temperature depending on phase and pressure. An answer is a resistive and magnetic transition at a calibrated pressure, or a bound excluding superconductivity above a stated temperature.
Settled by: Four-probe transport and magnetic measurements on metallic hydrogen in a diamond anvil cell showing a field-dependent transition.
Kind: well-posed
Answer type: value
References: (empty)
Literature status: open
Status note: (empty)
Posed since: 1968

Decisions