Why is the same thermos able to be used for both cold and hot food or liquid?
A thermos works because it uses a vacuum in between the outer and inner layers. That is, completely empty space. A thermos is basically two separate containers, with nothing in between them , not even air. The two containers connect at very few points. Heat can only transfer through matter. If there’s no matter between the inner container and outer container, there’s no way for the heat of a hot beverage to escape, and there’s no way for heat outside the thermos to get into a cold beverage. Heat doesn’t just go away – it has to go somewhere, and it has to go by transferring to an adjacent piece of matter. If you stick one end of a metal rod into a fire, eventually the end you’re holding is going to get hot. It will get hot because the heat is being transferred from the fire all the way along the rod, from one end to the other. if you stick two metal rods near each other, connected by very small pieces of filament, so that very little of the two rods are actually touching each other, an
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