Is it possible to make metallic hydrogen?

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Discussion Overview

The discussion revolves around the possibility of creating metallic hydrogen, exploring its potential benefits as a fuel source and the conditions required for its formation. Participants examine theoretical and experimental aspects, including temperature and pressure conditions, as well as the implications of metallic hydrogen in natural environments like gas giants.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that lowering hydrogen gas to its melting point could potentially create metallic hydrogen, although they invite feedback on this theory.
  • Another participant claims that metallic hydrogen exists under the extreme pressures found in gas giants, specifically mentioning the conditions on Jupiter.
  • A different participant clarifies that simply freezing hydrogen results in solid hydrogen, not metallic hydrogen, and notes the difficulty in producing stable metallic hydrogen.
  • Some participants propose that applying hundreds of GPa of pressure could lead to the formation of metallic hydrogen.
  • There is mention of a recent controversial claim from a European group about producing stable metallic hydrogen, alongside historical references to experiments from the mid-1990s that observed metallic fluid hydrogen.
  • One participant recalls the long-held belief that metallic hydrogen exists in the cores of Jupiter and Saturn, contributing to their magnetic properties.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of creating metallic hydrogen, with some asserting it is possible under specific conditions while others emphasize the challenges and lack of definitive evidence for stable metallic hydrogen. The discussion remains unresolved regarding the methods and conditions necessary for its creation.

Contextual Notes

There are limitations in the discussion regarding the definitions of metallic hydrogen and solid hydrogen, as well as the unresolved nature of experimental claims and the conditions under which metallic hydrogen may be produced.

J46537
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I'm wondering if it is possible to make metallic hydrogen. Metallic hydrogen would be a good thing to have because hydrogen is an excellent fuel source, and since it is; under STP, a gas, having it be in a metallic form would be a great way to carry lots of hydrogen, only with less volume in transportation. The way I see it, it would improve efficiency as a fuel/propellant. I was thinking that since the melting point and the freezing point of a substance are essentially equivalent, it might be possible to make hydrogen gas into a metallic form by lowering the temperature of hydrogen gas to its melting point (-259.14°C). If this theory has any flaws in it, please tell me about them.
 
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I've heard that inside some of the gas planets in our solar system, the pressure is so incredibly high that Hydrogen assumes an unheard of state. That state being "Metallic" Hydrogen, so to answer the question, it is indeed possible. However it requires the pressure of Jupiter. XD
 
Freezing hydrogen you will get just a solid hydrogen, not a metallic hydrogen (different crystalline structure and different properties). As far as I know so far nobody made a solid, stable metallic hydrogen, and not because of lack of experiments designed to do so - it is just extremely difficult (if at all possible).
 
sure you can; put it under hundreds of GPa would do the trick.
 
chill_factor said:
sure you can; put it under hundreds of GPa would do the trick.

That was the point Borek was making (I suspect) - people have put hydrogen under hundreds of GPa, and no one has yet been able to clearly demonstrate that they've produced solid, stable metallic hydrogen. There was a recent claim just last year from a European group that they did so, but there was some controversy about their experimental setup.

I recall a group from Lawrence Livermore (or possibly another DoE lab) had observed metallic fluid hydrogen back in the mid-1990s, but my memory is foggy on the details of that experiment.
 

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