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Enchydrogen t1_iyd8bii wrote

Reply to comment by ok46reddit in Rolls-Royce successfully tests hydrogen-powered jet engine by Majnum

I was not saying you can change the physics of hydrogen's density, rather the way in which it is currently stored in gaseous form will improve as technology progresses. I agree that ammonia is a viable green alternative but as I understand it is not the best for combustion and adds to engine complexity and cost. LNG is not a green alternative.

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ok46reddit t1_iyda979 wrote

LNG is not currently a viable green alternative just like Hydrogen isn't.

There is no limitation of either chemistry or physics that would prevent totally green LNG from becoming a thing, like there is for practical hydrogen stroage for transportation.

And many of the limitations you mention of ammonia can be overcome by adding a small percentage of hydrogen to the fuel mix. A much more ready to go alternative than hydrogen alone. And the hydrogen can be obtained by cracking the ammonia itself as needed as part of the engine system's operation, using waste heat.

https://newatlas.com/aircraft/aviation-h2-ammonia-fuel-jet-aircraft/

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Vickrin t1_iyf4pmm wrote

> rather the way in which it is currently stored in gaseous form will improve as technology progresses

Technology cannot change the laws of physics.

There is a base minimum amount of space requires to store gaseous hydrogen, if you go below that you get liquid hydrogen and even bigger storage problems.

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