The ones that keep your water warm or cold for hours and hours.
In: Engineering
Some types of heat (energy) like to transfer kinetically through collisions among atoms. If there are no atoms, like in a vacuum, then this kinetic transfer mechanism can’t happen.
The better the vacuum and the completely it surrounds your beverage (i.e., no uninsulated caps or screws that go through the vacuum lining), the longer your drink stays hot/cold.
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