Dewar flask is used to ship which substance?

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Multiple Choice

Dewar flask is used to ship which substance?

Explanation:
Dewar flasks are vacuum-insulated, double-walled containers that minimize heat transfer, allowing very cold liquids to be stored and shipped without rapidly warming and boiling away. Because of that, they are used to transport cryogenic liquids. Liquid oxygen is shipped as a cryogenic liquid, kept near its boiling point so it remains liquid during transit, which is exactly what a Dewar is designed to do. The other options are not typical cryogenic liquids transported this way: acetylene is normally kept as a gas under pressure (or in a stabilized liquid form), and the remaining items refer to gases that are shipped as compressed gases rather than as cryogenic liquids in a Dewar. So the substance best suited for a Dewar flask is liquid oxygen.

Dewar flasks are vacuum-insulated, double-walled containers that minimize heat transfer, allowing very cold liquids to be stored and shipped without rapidly warming and boiling away. Because of that, they are used to transport cryogenic liquids. Liquid oxygen is shipped as a cryogenic liquid, kept near its boiling point so it remains liquid during transit, which is exactly what a Dewar is designed to do. The other options are not typical cryogenic liquids transported this way: acetylene is normally kept as a gas under pressure (or in a stabilized liquid form), and the remaining items refer to gases that are shipped as compressed gases rather than as cryogenic liquids in a Dewar. So the substance best suited for a Dewar flask is liquid oxygen.

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