The big difference in Holmlid’s concept of dense hydrogen and the densest possible phase if water ice is the required pressure.
Ice-11 cannot exist on earth outside of a diamond anvil press. Holmlid says the UDH of his theory actually forms in a near vacuum while the dense ice requires unbelievably high pressure to form. This makes the two concepts hard to rationalize with mainstream understanding. The need for massive pressure is the reason that Holmlid is not making true metallic hydrogen. OTOH - I agree with anyone who opines that Holmlid has not been able to physically prove his UDH concept to the mainstream - and until then, it remains hypothetical. BTW the most authoritative site on the web for understanding any and every detail about water is the one maintained by Martin Chaplin in the UK. http://www1.lsbu.ac.uk/water/water_structure_science.html Here is his page for ice-11. He has a separate entry for every phase. http://www1.lsbu.ac.uk/water/ice_xi.html Jones From: Axil Axil https://www.quantamagazine.org/black-hot-superionic-ice-may-be-natures-most-common-form-of-water-20190508/ ICE 11 is most likely the ultra dense water that Mark LeClair discovered when he used lasers to generate super powerful cavitation bubble collapse. LeClair called that stuff "the water crystal" Here is the ice 11 state diagram: https://qph.fs.quoracdn.net/main-qimg-9f0f50f59a4c1e9d374a004a21565188.webp Scientists have confirmed the existence of “superionic ice,” a new phase of water that is black and hot first theoretically predicted more than 30 years ago. Although it has never been seen until now, scientists think the new state of matter, it might be among the most common forms of water in the universe. “It’s not quite a new phase of water. It’s really a new state of matter,” said physicist Livia Bove Physicists have been unlocking the secrets of superionic ice for years. In 1988, chemist Pierfranco Demontis at the University of Sassari predicted water would take on this strange, almost metal-like form if pushed beyond the map of known ice phases. This stuff is similar to the dense hydrogen that Holmlid produces in that there is a multi particle positive core and a negative particle surrounding cloud. I bet it is also superconducting at very high temperatures.
