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What was the primary use of Dewar's vacuum flask?

Storing food
Liquefaction of gases
Holding water
Storing chemicals

Answer

Liquefaction of gases was the primary use of Dewar's vacuum flask. This flask, invented by Sir James Dewar, is a double-walled container with a vacuum between the walls. The vacuum prevents heat transfer by conduction and convection, making the flask highly effective at maintaining the temperature of its contents. This property made it ideal for liquefying gases, which requires cooling them to extremely low temperatures.