I want to know if helium will liquify under a certain pressure and exactly how much pressure would it take?
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2$\begingroup$ Don't post questions for which you are likely to find answers on the Google. You'll find enough details from the internet. See Liquid helium $\endgroup$– leeCommented Feb 8, 2021 at 3:20
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1$\begingroup$ You missed out on Heike Kamerlingh Onnes' Nobel prize of 1913. $\endgroup$– my2ctsCommented Feb 8, 2021 at 5:38
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$\begingroup$ The question becomes meaningful if you specify the temperature. $\endgroup$– GiorgioP-DoomsdayClockIsAt-90Commented Feb 8, 2021 at 7:31
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1$\begingroup$ I’m voting to close this question because it's a question asking for reference data which can be searched online. $\endgroup$– YashasCommented Feb 8, 2021 at 8:40
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1 Answer
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See the He phase diagram in my answer to How much pressure will be generated if liquid helium is placed in a sealed container at room temperature?. Below 5 K He can be two phase liquid/gas at certain pressures. Below about 0.75 K it is all liquid.
answered Feb 8, 2021 at 3:21
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$\begingroup$ Good answer. +1. You might want to add that above the critical temperature of 5.2 K no amount of pressure will liquefy helium. $\endgroup$– DaleCommented Feb 8, 2021 at 3:35
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$\begingroup$ @Dale Yes, thanks. My referenced earlier answer does address the critical point at about 5K. $\endgroup$ Commented Feb 8, 2021 at 3:40