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What processes of heat transfer are affected with thermos flasks?
Wiki User
∙ 12y ago
Conduction, convection and heat radiation.
Wiki User
∙ 12y ago
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How does a thermos flask keeps a hot liquid hot and a cold liquid cold?
A thermos is able to do what it does by using a several of physical and material properties to keep our hot chocolate hot and our ice tea icy. A thermos has an inner container made of glass. This container is really like one bottle inside of another bottle and sealed at the ends by melting the edges together. The air is removed out from the space between the two bottles to produce a vacuum, which is not a good conductor of heat and does a good job at slowing down the movement of heat. To slow down the other heat they coat the facing surfaces of the glass bottles with a silvery coating (like a mirror). This reflects the heat and helps slow down any losses that might get that way. They use a material like cork or rubber to make the bottle stopper and anything else that might touch the outside surface of the glass container. These materials are bad conductors of heat and slow down the heat loss. What's left is what we can see on the outside which can be metal or plastic and is the covering for the glass bottles. The idea here (with the thermos) is to slow down the movement of heat from one place to the other. So if you have hot stuff in the thermos or cold stuff in the thermos, the end result is the same. Keep heat from moving to where you don't want it to go for as long as possible. NB It's worth mentioning that modern vacuum flasks (Thermos being a trade name) are made almost entirely of stainless steel, inside and out - it doesn't shatter and is naturally reflective, although not polished to a mirror shine when used as a flask inner. Modern stoppers are also made of plastic.
Where can one purchase a liquor flask?
Liquor flasks are available at many liquor stores as well as major retailers and some clothing stores. In addition, liquor flasks can often be purchased from liquor manufacturers/distillers.
Why is a round bottomed flask used in fractional distillation rather than a flat bottomed flask?
Flat bottom flasks (Erlenmeyer and Florence flasks) are used for heating all the time.
Which equipment would help you separate a liquid mixture by distillation a freezer sand or gravel two flasks a heat source and a condensing tube a sieve such as a colander or kitchen strainer?
You need a heat source, a condensing tube and flasks.
What measures liquids?
burettes, pipettes, volumetric flasks, graduated cylinders, beakers.
How do you build a thermos flasks?
with tools
How do you insulated thermos?
Um......your question is worded oddly, but the way an thermos is insulated is by having a vacuum between it's two flasks. The vacuum causes heat transfer to reduce greatly.
What is a thermos flasks structure?
It is a container that keeps the tempreature constint by using certain matrials.
Things used to keep heat in or cold out?
insulation blankets thermos flasks double glazing
Who create a thermos?
This is from wikipedia: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 trademark for their flasks, remains a registered trademark in some countries but was declared a genericized trademark in the U.S. in 1963 as it is colloquially synonymous with vacuum flasks in general.
Why is the thermos flask a great invention?
Thermos Flasks were invented in 1892 by Sir James Dewar. They consist of two flasks, one placed over the other and joined at the neck. The main advantage of using a Thermos is to keep hot beverages hot and cold beverages cold.
Why does vacuum flasks silvered on the inside?
The motivation is to avoid heat transfer by thermal radiation.
How does the thermos maintain heat?
A real one is a vacuum flask (or better: two flasks with a vacuum between them) - and so the only heat loss is via radiation (except at the cap). But most today are simply foam insulation.
How does a flask keep hot liquid hot?
There are several types of flasks. They are all containers or vessels, usually designed to carry a liquid and often made of glass. They sometimes have a cap and are narrower at the top, but usually do not have a handle.The first distinction is flasks that are used in a laboratory. There are several types, including erlenmeyer flasks, florence flasks, round bottom flasks, distilling flasks, volumetric flasks, and others. A description of each one is listed to the left under the Related Questions links.Another type of flask is instead used to carry alcohol. It is a small container usually shaped to fit in a back pocket. It can hold any liquid but usually was designed for alcohol.See the Related Questions and Web Links to the left for more information and pictures of different types of flasks.
Why are vacuum flasks called vacuum flasks?
why are vacuum flasks called vacuum flask
What is the uses of measuring cylinder filter flasks conical flasks round-bottomed flasks in the chemistry?
IS IS
What is the meaning of conical flasks?
There is no meaning of conical flasks. They have uses.
