Of course you can!
You can keep ice cream in it to keep it warm.
A thermos has a double-layer structure in the center, with a vacuum between the two layers.
There are two ways for an object to lose heat in the air
1, heat transfer - the thermal conductivity of the container, and the thermal convection of the air. 2, heat radiation .
So thermos insulation needs to be designed for the above points:
* Vacuum can avoid heat convection.
* insulation cup of the inner layer is silver, can be the container inside the heat radiated to the outside to reflect back.
In turn, if the bottle stores cold liquids, this bottle can prevent the outside of the heat radiated into the bottle.
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