A vacuum flask is able to keep cold liquid cold because it (i) fcnwiefdwp❤️ G decreases the rate at which heat flows into the liquid (ii) decreases the rate at...
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Explanation:
A vacuum sleeve keeps liquids hot by stopping the escape of heat through three layers of protection (inner, vacuum, outer) and keeps liquids cold by not letting heat from outside enter the container, this achieved via double wall stainless steel.
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