Hydrogen stored as a liquid is cooled to which temperature?

Hydrogen stored as a liquid is cooled to which temperature?

• A. -196 F
• B. -320 F
• C. -423 C
• D. -423 F

Answer: (D)

Liquid hydrogen remains in the liquid phase only near its boiling point at standard pressure. That boiling point is about 20.28 kelvin, which converts to approximately −252.87°C or −423.07°F. So to store hydrogen as a liquid, you cool it to around −423°F. The other temperatures correspond to other substances or lie outside hydrogen’s liquid range at 1 atm (for example, −196°F is the boiling point of nitrogen, not hydrogen).

Liquid hydrogen remains in the liquid phase only near its boiling point at standard pressure. That boiling point is about 20.28 kelvin, which converts to approximately −252.87°C or −423.07°F. So to store hydrogen as a liquid, you cool it to around −423°F. The other temperatures correspond to other substances or lie outside hydrogen’s liquid range at 1 atm (for example, −196°F is the boiling point of nitrogen, not hydrogen).