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12 May, 14:14

How does a vacuum flask keep drinks hot? Explain in terms of conduction, convection and radiation.

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  1. 12 May, 17:48
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    Vacum flask has inner layer of glass and outer body of plastic. the glass has a reflective metal layer ... when a hot drink is poured into the flask it prevents conduction. tight lid stops the convection. when radiation tries to leave the hot drink the reflective layer of the glass reflects it back so no heat can escape.
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