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If only the silvering is gone, it can still be used, but it won't be as good. However, quite often the silvering is inside the vacuum compartment; if the silvering has vanished because the glass cracked, it is very probably unsafe to use.
A thermal flask works by preventing heat conduction (the vacuum layer will not conduct heat) and by preventing heat radiation (the silver layer reflects the heat back at the contents).
Without the silver layer, the heat will not be reflected. The flask will still work, but will lose or gain heat faster that it would if the silvering was intact.
Note: The "silvering" on older flasks may be Mercury. If the envelope is cracked and the mercury evaporates, it could prove toxic. Newer flasks use aluminum.
What else can I help you with?
Is it safe to store liquid nitrogen in an ordinary household thermos?
Old glass thermoses are very similar to dewars used in chemistry for carrying liquid nitrogen.A glass thermos would be safe for transporting and temporary storage of liquid nitrogen.However, it would not be recommended to seal the top tightly with the stopper as the liquid nitrogen will slowly evaporate and pressure could build up inside the thermos.
How do you use thermos bottle in a sentence?
you fill the thermos bottle with liquid in gas occlusion's
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.
Do you use titrant in conical flask?
yes we use titrant in the conical flask ,this is because titrant is a solution we use in burrete for titration in this process we titrant the solution in the conical flask along with an indicator
What Scientist who use S shaped flask?
Louis Pasteur, a French chemist, popularized the use of the S-shaped flask in his experiments to disprove the idea of spontaneous generation. The S-shaped flask allowed air to enter the flask, preventing contamination from airborne microorganisms while still allowing for the exchange of gases.
What is the use of double layered glass in a thermos flask?
To see through :0
What the conduction in thermos flask?
Conduction in a thermos flask is minimized through the use of a vacuum layer between two walls of the flask. This vacuum layer prevents heat transfer by conduction, as there are no molecules present to transfer the heat. This helps to keep the contents of the flask hot or cold for an extended period of time.
Use a sentence with the word flask?
She lived in the moment and drank freely from the flask of life's finest adventures. I am on a quest to retrieve yon flask. huh??
How is conduction prevented in a thermos flask?
There are many ways this is done. It can be done by having a double walled thermos with either air, an insulator, or a vacuum between. A vacuum will prevent all conduction except where the two walls touch but requires stronger materials.
Why is a thermos flask made of steel?
A thermos flask is made of steel because steel is a good insulator, which helps maintain the temperature of the liquid inside the flask for longer periods. Steel is also durable and easy to clean, making it a practical material for use in thermos flasks.
How is heat loss minimized in a thermos flask?
Heat loss in a thermos flask is minimized through the use of a vacuum layer that acts as insulation, preventing heat transfer by conduction or convection. Additionally, the inner and outer walls of the flask are often made of materials with low thermal conductivity to further reduce heat loss. Finally, the flask is usually sealed with a tight-fitting cap to prevent heat loss through evaporation.
What is a better material to use in a thermos flask?
Stainless steel is a popular material for thermos flasks because it is durable, has good insulating properties, and is easy to clean. Vacuum-insulated stainless steel thermos flasks can keep liquids hot or cold for long periods of time.
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.
How does a thermos flask reduce heat loss by conduction?
Using vacuum as an insulator avoids heat loss by conduction. Heat transfer is minimised by reflective silver surfaces that are applied to the flask. This prevents thermal radiation from entering and escaping the flask.
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.
Is it safe to store liquid nitrogen in an ordinary household thermos?
Old glass thermoses are very similar to dewars used in chemistry for carrying liquid nitrogen.A glass thermos would be safe for transporting and temporary storage of liquid nitrogen.However, it would not be recommended to seal the top tightly with the stopper as the liquid nitrogen will slowly evaporate and pressure could build up inside the thermos.
