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The vacuum space between the two silvered surfaces make efficient heat insulation against heat loss.

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What is the use of a vacuum in thermos flask

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Q: What is the use of double glass in thermos flask?
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What is the use of double layered glass in a thermos flask?

To see through :0

When is it preferable to use a plastic volumetric flask?

The plastic flask is needed for trace analysis on analytes at ppb levels that might be lost by adsorption on the glass surface.

How do you use the word flask in a sentence?

You should always be cautious when heating chemicals in a flask. The glass flask containing phosphoric acid was soon leaking its contents onto the floor.

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.

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.

How does thermos flask maintain the temperature of the object inside it?

The flask makes use of heavy insulation, either by vaccum, air cushion or just filled with very poor heat conductors to slow the heat loss from a hot drink or warming from the enviroment.

What did Sir James Dewar use the thermos for?

He didn't. He used a Dewar or vacuum flask. It is used to keep things hotter or colder than the surrounding ambient temperature. He failed to patent the idea and it was subsequently patented by Thermos. Thermos is still a registered trade mark in many countries, though it has been declared generic in the US.

What is the best way to keep water warm without using a heating object?

The best way to do so be be to use a good thermal insulator. A thermos flask would suit this purpose.

How do you use the word thermos in a sentence?

my thermos was full with ice cold water.

How do you use thermos bottle in a sentence?

you fill the thermos bottle with liquid in gas occlusion's

How do you deal with the liquid mercury scattered in laboratory?

Set up a vacuum flask with flexible intake tubing long enough to reach the mercury spill. Use glass tubing on the inside of the flask to reach nearly to the bottom on the intake side. On the other side (the side connected to the vacuum source) make sure the glass tubing reaches just inside the flask, near the top, so that the mercury entering the flask will not simply be sucked into the vacuum source lines. Use a two-holed rubber stopper to accomplish all this. This will give you a mercury vacuum cleaner, so to speak. Use a regulator and be careful to use just enogh vacuum to lift the mercury into the flask.

How do you eat a thermos flask?

To set about eating a thermos flask you would first need to recognise what the flask is made of. The simplest thermos will have an inside layer of glass, surrounded by air, surrounded by an outside layer of glass, with both these layers covered in mercury or something similar, and the whole thing covered in plastic or metal. The first step in eating the flask would be to separate all these layers. Heavy tools will help to smash the glass and mercury and remove them from the tougher outer casing. Glass can be broken down and eaten pretty easily. Some people have a party trick of eating lightbulbs or wine bottles, and they can do this because it won't actually cut your mouth like you think it would. So long as you chew in a slow, controlled fashion, and use your tongue to adjust any pieces that feel sharp against your mouth, you should be able to eat the glass pretty easily. The mercury should also be pretty easy, as the layer will be thin and crumple up with little effort. This layer is also probably poisonous, so it is recommended you leave eating the mercury til last. The outer casing will provide the biggest problem, as it will be made of a robust material that cannot be easily chewed or digested. If it is plastic, then a particularly strong grater will be able to prepare it for eating as a condiment on your usual meals. If it is metal, then you will need to ask a local blacksmith or anyone who works with hard machinery to reduce the metal into filings which can be used in much the same way.