Most thermoses during this age come with an efficiency of at least 90%,and usually can't exceed 100% efficiency because it doesn't go along the law of second thermodynamics. Which states that nothing can be 100% efficient because due to conversions between substances heat is lost. The flask of a thermos is made of a thin low thermal conductance material, the space is a vacuum filled so conduction doesn't occur, and the shiny interior outside and inside of the thermos is used to prevent radiation.
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