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Engineering · L2 · How a Thermos Flask Stops Heat Escaping

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The vacuum gap, reflective walls, and sealed lid that combine to keep a thermos flask's drink hot or cold.

by @openstemUpdated Engineering
☕ Hot drink inside flaskHeat reaches inner wallVacuum gap between wallsAlmost no matter to carry heat acrossVery little heat reaches outer wallReflective coating bounces radiated heat backSealed lid stops warm air escaping upward🌡️ Drink stays hot for hours

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