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Thermos vacuum insulated glass double wall flask.
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Inside a thermos is glass and around the glass is a vacuum.
A vacuum flask also known as a dewar flask dewar bottle or thermos is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask s surroundings.
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The glass is silvered like a mirror to reduce infrared radiation.
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The glass envelope is fragile so it is encased in a plastic or metal case.
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Invented by sir james dewar in 1892 the vacuum flask consists of two flasks placed one within the other and joined at the neck the gap between the two flasks is partially evacuated.
The combination of a vacuum.