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Gas and liquid Hydrogen?


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To liquefy hydrogen you need to make it very cold (about 240 below zero). Even at that temperature you need to compress it too (to about 13 atmospheres).

To get it liquid at normal pressures you need to cool it another dozen degrees or so to about 253 below .


I wonder where you have ever seen liquid hydrogen, it's not easy to see- it is cold enough that the air round it liquefies too, then the air freezes. Liquid hydrogen isn't easy to work with.

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