by PanelDeland » Thu Oct 15, 2009 4:36 pm
the thing to remember about a thermos(any brand) is that they are a vacuum bottle.They hold heat in by vacuum.As the liquid trys to release it's heat(remember that things expand when they heat and contrct when they cool) a vacuum is formed keeping everything in,including the heat.If the stopper is not vacuum tight it will lose heat.
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