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Why should a thermos flask not be filled to the brim? - Quora
thermodynamics - Why did my thermos flask/jug explode after stirring with a stainless steel spoon? - Physics Stack Exchange
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Amazon.com: Koolatron 12V Insulated Vacuum Flask with Heater, 1L Silver and Black Stainless Steel, Push Button Dispenser, for Car, SUV, Truck, RV, Boat : Home & Kitchen
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Inside Glass Thermos Flask Coated Silver Stock Photo 1603594600 | Shutterstock
