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What is the Dewar flask primarily used for today?

Storing food
Scientific research
Medical purposes
Household use

Answer

Scientific research is the primary use of the Dewar flask today. It is a double-walled glass container with a vacuum between the walls, which provides excellent thermal insulation. This makes it ideal for storing and transporting liquids at extremely low or high temperatures, such as liquid nitrogen or liquid helium. Dewar flasks are also used in cryogenics, chemistry, and physics research.