A Dewar flask is commonly used as a vessel for storing what?

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Multiple Choice

A Dewar flask is commonly used as a vessel for storing what?

Explanation:
A Dewar flask is designed to store cryogenic liquids by minimizing heat input. Its double-wall construction with a vacuum in between, plus a narrow neck and sometimes a vent, dramatically reduces heat transfer. This keeps very cold liquids from warming up and boiling away quickly. Because of this function, a Dewar flask is the type of vessel used for storing liquefied gases like oxygen in cryogenic form. The other options don’t fit that purpose: a compressed gas cylinder holds gas under pressure, not a cryogenic liquid, and drinking water isn’t kept in a cryogenic insulated vessel. While liquid nitrogen is also stored in dewars, the scenario described best aligns with storing liquid oxygen, which is a common cryogenic application.

A Dewar flask is designed to store cryogenic liquids by minimizing heat input. Its double-wall construction with a vacuum in between, plus a narrow neck and sometimes a vent, dramatically reduces heat transfer. This keeps very cold liquids from warming up and boiling away quickly.

Because of this function, a Dewar flask is the type of vessel used for storing liquefied gases like oxygen in cryogenic form. The other options don’t fit that purpose: a compressed gas cylinder holds gas under pressure, not a cryogenic liquid, and drinking water isn’t kept in a cryogenic insulated vessel. While liquid nitrogen is also stored in dewars, the scenario described best aligns with storing liquid oxygen, which is a common cryogenic application.

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