Vacuum flask

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A topic known well beyond its field, found in many languages.

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Notion

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Science and technology

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What Wikipedia says

A vacuum flask (also known as a Dewar flask, Dewar bottle or thermos) is an insulating storage vessel that slows the speed at which its contents change in temperature. It greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings by trying to be as adiabatic as possible.

Excerpt from the Wikipedia article “Vacuum flask”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Schekinov Alexey Victorovich, CC BY-SA 4.0, via Wikimedia Commons.