Answered

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Why is helium so difficult to liquefy?

Sagot :

Gibbs
Helium is very difficult to liquify because it only exists in its liquid form at an extremely low temperature. This temperature is low temperature of −269 °C (about 4 K or −452.2 °F). It is only possible to maintain liquid helium in a highly artificial environment where this low temperature can be created. 
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