Cryogenic liquids are typically stored at approximately which temperature?

Cryogenic liquids are typically stored at approximately which temperature?

• A. -130F or -90C
• B. -196C
• C. -80C
• D. -90F

Answer: (A)

Cryogenic liquids are kept at extremely low temperatures to stay in liquid form and minimize boil-off. A practical, widely used storage temperature for many cryogens is about -90 C, which is the same as -130 F. This level is cold enough to keep a broad range of cryogenic liquids stable in insulated dewars while being achievable with standard equipment. Some cryogens actually require colder storage, such as liquid nitrogen stored near -196 C, but for general, typical storage across various cryogenic liquids, -90 C is the common target. The other options don’t reflect this common practice: -196 C is specific to one substance, -80 C is often associated with ultra-low freezers rather than general cryogenic storage, and -90 F corresponds to about -67.8 C, which is not cold enough for standard cryogenic storage.

Cryogenic liquids are kept at extremely low temperatures to stay in liquid form and minimize boil-off. A practical, widely used storage temperature for many cryogens is about -90 C, which is the same as -130 F. This level is cold enough to keep a broad range of cryogenic liquids stable in insulated dewars while being achievable with standard equipment.

Some cryogens actually require colder storage, such as liquid nitrogen stored near -196 C, but for general, typical storage across various cryogenic liquids, -90 C is the common target. The other options don’t reflect this common practice: -196 C is specific to one substance, -80 C is often associated with ultra-low freezers rather than general cryogenic storage, and -90 F corresponds to about -67.8 C, which is not cold enough for standard cryogenic storage.