From Clive Semmens, Ely, Cambridgeshire, UK
If metallic hydrogen were a room-temperature superconductor, experiments on it might produce useful information. But, given the enormous pressures that seem to be required to keep it metallic, it surely isn’t practically useful.
A thought occurs to me: have any of the teams doing these experiments considered using pure deuterium, an isotope of hydrogen? I suspect that the pressure required to might be significantly lower. It would pretty certainly still be much too high for practical applications, but possibly easier to experiment on.
