出典:Wiktionary
vacuum flask (複数形 vacuum flasks)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/05 11:10 UTC 版)
A vacuum flask, colloquially called a thermos after a genericized ubiquitous brand, is a storage vessel which provides thermal insulation by interposing a partial vacuum between the contents and the ambient environment. The evacuated region of the partial vacuum removes material that could serve as a heat conductor or carrier, enabling the flask to keep its contents hotter or cooler than its surroundings. Vacuum flasks are commonly used as insulated shipping containers.