"Thermos" redirects here. For the company, see Thermos LLC. 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.
The typical design of a Thermos brand vacuum flask, used for maintaining the temperature of fluids such as coffeeLaboratory Dewar flask, Deutsches Museum, MunichDiagram of a vacuum flaskA cryogenic storage dewar of liquid nitrogen, used to supply a cryogenic freezer
A vacuum flask (also known as a Dewar flask, Dewar bottle or thermos) is an insulating storage vessel that slows the speed at which its contents change in temperature. It greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings by trying to be as adiabatic as possible. 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 of air, creating a near-vacuum which significantly reduces heat transfer by conduction or convection. When used to hold cold liquids, this also virtually eliminates condensation on the outside of the flask.
Vacuum flasks are used domestically to keep contents inside hot or cold for extended periods of time. They are also used for thermal cooking. Vacuum flasks are also used for many purposes in industry.
A vacuumflask (also known as a Dewar flask, Dewar bottle or thermos) is an insulating storage vessel that slows the speed at which its contents change...
A thermal cooker, or a vacuumflask cooker, is a cooking device that uses thermal insulation to retain heat and cook food without the continuous use of...
Büchner flask is a common design modification for filtration under vacuum. The slanted sides and narrow neck of this flask allow the contents of the flask to...
mostly in China, and use double-wall vacuum insulation to help keep liquids cold or hot. As of October 2019, Hydro Flask offered customizable water bottles...
pumping the air out of the flask and replacing the resulting vacuum with an inert gas. For example, evacuation of the flask to 1 mmHg (130 Pa; 0.0013 atm)...
Schlenk flask, which is a spherical flask with a ground glass opening and a hose outlet and a vacuum stopcock. The tap makes it easy to connect the flask to...
test tubes Erlenmeyer flask, a common laboratory flask with a flat bottom, a conical body, and a cylindrical neck Vacuumflask, a container designed to...
used sometimes, since the early 20th century, as a term for any vacuum-insulated flask regardless of manufacturer. From around 1910 until 1922, the American...
it is usually assembled into a vessel, similar in construction to a vacuumflask or Dewar. Cryostats have numerous applications within science, engineering...
British chemist and physicist. He is best known for his invention of the vacuumflask, which he used in conjunction with research into the liquefaction of...
contained in the vacuumflask and the Büchner flask. There is therefore a difference in pressure between the exterior and the interior of the flasks : the contents...
A cryogenic storage dewar (or simply dewar) is a specialised type of vacuumflask used for storing cryogens (such as liquid nitrogen or liquid helium)...
Business Insider calls them "a status symbol in the United States". Vacuumflask "YETI Holdings Inc". Market Watch. July 17, 2019. Retrieved July 17,...
Dewar Dewar (caste), a fishing caste from India Vacuumflask (also known as a Dewar flask), a vacuum-insulated container used to maintain internal temperature...
Esky is a brand of portable coolers, originally Australian, derived from the word "Eskimo". The term "esky" is also commonly used in Australia to generically...
Vacuum cooking may refer to: Vacuumflask cooking Sous-vide, a type of sealing vacuum cooking Sousvide Supreme This disambiguation page lists articles...
for its superficial appearance to a Thermos bottle, a popular brand of vacuumflask. The bomb was a cylinder 31 centimetres (12 in) long and weighing 3.68...
they partnered with 4ocean to clean the beaches of Siesta Key, Florida. Vacuumflask "The Tervis Story". Tervis Tumbler. Retrieved October 15, 2018. "An American...
the holding time of vacuumflasks ranges from a few hours to a few weeks. The development of pressurised super-insulated vacuum vessels has enabled liquid...
instance, at the receiving flask) to allow the internal pressure to equalize with atmospheric pressure. Alternatively, a vacuum pump may be used to keep...
funnel and receiving flask to the reaction flask against a flow of nitrogen, carefully inverting the set-up, and turning on the vacuum appropriately, the...
insulation between two vacuum-tight layers of rubber; this vacuum layer insulates the wearer's feet similar to a vacuumflask.[citation needed] These...
A Florence flask/boiling flask is a type of flask used as an item of laboratory glassware and is named after the city Florence. It is used as a container...
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