Thermos Vacuum Insulated Glass Double Wall Flask

The combination of a vacuum.

Thermos vacuum insulated glass double wall flask.

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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 glass is silvered like a mirror to reduce infrared radiation. Inside a thermos is glass and around the glass is a vacuum.