At what temperature does helium liquefy?

Helium liquefies at a very low temperature, specifically around -268.93 degrees Celsius or -452.07 degrees Fahrenheit, which is just above absolute zero. The correct answer, indicating -453 degrees Fahrenheit, is extremely close to the actual liquefaction point of helium, reflecting its unique properties among gases.

Understanding the significance of this temperature is crucial, especially in cryogenics, where helium is commonly used as a refrigerant due to its low boiling point. Helium remains a gas at standard temperatures and pressures and only transitions to its liquid state under extreme conditions, typically requiring a combination of pressure and very low temperatures.

Other options reflect temperatures that are either too high or outside the range at which helium would transition to a liquid state, thus highlighting the extreme conditions necessary for helium liquefaction.