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Caption: A small lunch-sized thermos. This thermos is a vacuum flask made of two stainless steel flasks. The space between the flasks is evacuated. This results in very good thermal insulating properties as the heat transfer via conduction or convection is greatly reduced.

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Keywords: beverage container, conduction, convection, dewar bottle, dewar flask, energy transfer, flask, heat, heat transfer, insulation, insulator, physical, physics, science, thermal, thermos, vacuum flask

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