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Subject: Invention


Author:
Vinicius
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Date Posted: 09:02:21 05/13/09 Wed


The vacum flask

A vacuum flask is a storage vessel or insulated shipping container which keeps its contents hotter or cooler than their environment without the need to modify the pressure, by interposing an evacuated region to provide thermal insulation between the contents and the environment. The vacuum referred to is used for thermal insulation; the contents are not in vacuum conditions.
The vacuum flask was invented by Scottish physicist and chemist Sir James Dewar in 1892 and is sometimes referred to as a Dewar flask after its inventor. The first vacuum flasks for commercial use were made in 1904 when a German company, Thermos GmbH, was formed. Thermos, their trade name for their flasks, remains a registered trademark in some countries but was declared a generalized trademark in the U.S. in 1963 as it is colloquially synonymous with vacuum flasks in general. In fact, it is far more common for Americans to use the term thermos than vacuum flask.

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