Which substance is described as being stored in a Dewar flask in the material?

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Multiple Choice

Which substance is described as being stored in a Dewar flask in the material?

Explanation:
A Dewar flask is designed to hold cryogenic liquids by greatly reducing heat transfer. Its double wall with a vacuum between them, plus reflective shields, minimizes heat coming in so the contained liquid stays cold longer and boils off more slowly. Liquid oxygen has a boiling point around 90 kelvin, so to keep it in the liquid state it must be stored at extremely low temperatures—precisely what a Dewar flask provides. In materials discussions about cryogenic storage, liquid oxygen is a classic example of a substance kept in a Dewar to stay liquid, though other cryogenic liquids can be stored similarly. The key idea is that the insulation of a Dewar keeps the liquid cold enough to remain liquid.

A Dewar flask is designed to hold cryogenic liquids by greatly reducing heat transfer. Its double wall with a vacuum between them, plus reflective shields, minimizes heat coming in so the contained liquid stays cold longer and boils off more slowly. Liquid oxygen has a boiling point around 90 kelvin, so to keep it in the liquid state it must be stored at extremely low temperatures—precisely what a Dewar flask provides. In materials discussions about cryogenic storage, liquid oxygen is a classic example of a substance kept in a Dewar to stay liquid, though other cryogenic liquids can be stored similarly. The key idea is that the insulation of a Dewar keeps the liquid cold enough to remain liquid.

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