vacuum flask

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Container for keeping things either hot or cold. It has two silvered glass walls with a vacuum between them, in a metal or plastic outer case. This design reduces heat transfer by radiation (prevented by the silvering) and conduction (prevented by the vacuum). A vacuum flask is therefore equally efficient at keeping cold liquids cold or hot liquids hot. It was invented by the British scientist James Dewar in about 1872, to store liquefied gases.

The three stars are taken from the arms of the Duchy of Selje. The flag uses the pan-Slav colours. Effective date: 25 June 1991. >>