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How is Hydrogen Liquefied?

Published in Hydrogen Liquefaction 1 min read

Hydrogen gas is primarily liquefied by cooling it to an extremely low temperature.

The Core Process: Extreme Cooling

The fundamental method for liquefying gaseous hydrogen involves significantly reducing its temperature. According to the provided information:

Gaseous hydrogen is liquefied by cooling it to below −253°C (−423°F).

Key Temperature Threshold

This specific temperature is crucial because hydrogen remains a gas at typical atmospheric conditions and even at the boiling points of many other substances like nitrogen or oxygen. Reaching this cryogenic temperature is necessary to change its phase from gas to liquid.

  • Required Temperature: Below -253°C (-423°F)

This process requires specialized equipment, such as cryocoolers and liquefaction cycles (like the Linde-Hampson or Claude cycle), to achieve and maintain such low temperatures efficiently. While the reference specifically highlights the temperature requirement, the underlying process typically involves compression, cooling, and expansion steps to reach the liquefaction point.