how does the thermos keep my tea hot for several hours?
In: 30
The main way objects lose heat is that they transfer it to cooler objects next to them. The tea will lose heat to the inner layer. There is a vacuum between the inner and outer layers. Because the inner and outer layers aren’t in physical contact, the heat can not be transferred to the outer layer. Thereby keeping the inside hot. (There are other heat loss methods like radiation that do transfer heat. Plus, the inner and out connect at the neck. Eventually, the heat will be lost but it takes a while)
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