vacuum flask

also called  Dewar Vessel, or Thermos Flask,  

      vessel with double walls, the space between which is evacuated. It was invented by the British chemist and physicist Sir James Dewar (Dewar, Sir James) in the 1890s. Thermos is a proprietary name applied to a form protected by a metal casing.

      The vacuum flask was devised to preserve liquefied gases by preventing the transfer of heat from the surroundings to the liquid. The evacuated space between the walls (which are ordinarily glass or steel) is practically a nonconductor of heat; radiation is reduced to a minimum by silvering the glass or steel. The chief path by which heat can be communicated to the interior of the inner vessel is at the vessel's neck, the only junction of the walls, which therefore is made as small as possible. This thermal isolation applies equally to heat, a hot liquid remaining at a high temperature in the flask for several hours.

* * *


Universalium. 2010.

Look at other dictionaries:

  • vacuum flask — vacuum flasks N COUNT A vacuum flask is a container which is used to keep hot drinks hot or cold drinks cold. It has two thin silvery glass walls with a vacuum between them. [BRIT] (in AM, usually use , vacuum bottle) …   English dictionary

  • vacuum flask — ► NOUN chiefly Brit. ▪ a container that keeps a substance hot or cold by means of a double wall enclosing a vacuum …   English terms dictionary

  • vacuum flask — vacuum .flask n BrE a special container that keeps liquids hot or cold = ↑thermos …   Dictionary of contemporary English

  • Vacuum flask — Thermos redirects here. For other uses, see Thermos (disambiguation). This article is about the vacuum insulated flask. For the flask used in filtration under vacuum, see Büchner flask. Domestic vacuum flask, used for maintaining the temperature… …   Wikipedia

  • vacuum flask — noun flask with double walls separated by vacuum; used to maintain substances at high or low temperatures • Syn: ↑vacuum bottle • Hypernyms: ↑flask • Hyponyms: ↑Dewar flask, ↑Dewar, ↑thermos, ↑ …   Useful english dictionary

  • vacuum flask — UK / US noun [countable] Word forms vacuum flask : singular vacuum flask plural vacuum flasks British a container that keeps liquids hot or cold …   English dictionary

  • vacuum flask — Diuaro indas statusas T sritis chemija apibrėžtis Termosas suskystintoms dujoms laikyti. atitikmenys: angl. Dewar flask; vacuum bottle; vacuum flask; vacuum vessel rus. сосуд Дьюара …   Chemijos terminų aiškinamasis žodynas

  • vacuum flask — termosas statusas T sritis fizika atitikmenys: angl. thermos; vacuum flask vok. Thermoflasche, f; Vakuumflasche, f; Warmbehälter, m rus. термос, m pranc. bouteille isolante, f; récipient isolant, m; thermos, f …   Fizikos terminų žodynas

  • vacuum flask — noun a) A bottle, flask or similar vessel having a vacuum between its inner and outer silvered walls; designed to maintain the temperature of its contents b) A Dewar vessel is the scien …   Wiktionary

  • vacuum flask — /ˈvækjum flask/ (say vakyoohm flahsk) noun → thermos. Also, vacuum bottle …   Australian English dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.