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Substance that contains the vacuum in a vacuum flask?
Glass
What is main disadvantages of using metal instead of glass in a vacuum flask?
becuase metal conducts heat
Why are the walls of the vacuum flask made from glass?
Glass is a good insulator, helping to maintain the temperature inside the vacuum flask. It is also transparent, allowing users to see the contents of the flask easily. Glass is also odorless and does not affect the taste of the liquids stored inside.
What is the function of the vacuum between the glass walls in a vacuum flask?
The vacuum between the glass walls in a vacuum flask acts as an insulator, preventing heat transfer through conduction or convection. This helps to maintain the temperature of the contents by minimizing heat loss or gain.
Why does a thermos flask have silvered glass and a vacuum?
A thermos flask has silvered glass to reduce heat transfer through radiation. The vacuum insulation minimizes heat transfer through conduction and convection, keeping the contents of the flask hot or cold for longer periods by preventing heat exchange with the surroundings.
What has no matter?
A true vacuum, which is difficult to create, is a space where there is nothing. AN ordinary vacuum flask has "almost" a vacuum between its mirrored glass surfaces, but no matter how long the vacuum pump is trying to remove air from inside the glass walls there will always be some left. By Willyrhus
What has matter?
A true vacuum, which is difficult to create, is a space where there is nothing. AN ordinary vacuum flask has "almost" a vacuum between its mirrored glass surfaces, but no matter how long the vacuum pump is trying to remove air from inside the glass walls there will always be some left. By Willyrhus
What is a boiling flasks proper name?
The proper name for a boiling flask is a round-bottom flask. These flasks are typically made of glass and have a spherical bottom to allow for even heating and boiling of liquids.
Why does the hot tea in a Thermos flask remain hot for a long time?
The Thermos (vacuum) flask has a double skinned glass cylinder inside. Between the two walls of the glass cylinder is a vacuum. The glass cylinder is also silvered on all inner and outer surfaces. Both the vacuum and the silvering help to prevent the rapid cooling of a hot liquid, or the warming of a cold liquid. The vacuum inhibits heat transfer by conduction. The silvering reflects the heat and inhibits the heat escaping from the flask. Thermos (often used for a vacuum flask) is a trade-name.Eventually, as anyone who uses a vacuum flask, the once hot drink will have become cool by the end of the day.
What is the main cause of heat loss in a normal thermos flask?
The main heat loss in a good thermos flask, is due to heat conducted through the material. (Glass or Stainless Steel). There should be little heat lost through the vacuum of the flask.
How does a vacuum flask reduce the rate of energy transfers?
A vacuum flask reduces the rate of energy transfers by using a vacuum between two walls to minimize heat conduction, which prevents heat from entering or escaping the flask. Additionally, the inner wall is coated with a reflective material to minimize heat radiation, further reducing energy transfer.
What is a Buchner or filter flask and how is it used?
From Wikipedia.com (see Link to the left):A Büchner flask, also known as a vacuum flask, filter flask, side-arm flask or Kitasato flask, is a thick-walled erlenmeyer flask with a short glass tube and hose barb protruding about an inch from its neck. The short tube and hose barb effectively acts as an adapter over which the end of a thick-walled flexible hose (tubing) can be fitted to form a connection to the flask. The other end of the hose can be connected to source of vacuum such as an aspirator vacuum pump or house vacuum. Preferably this is done through a trap (see below), which is designed to prevent the suckback of water from the aspirator into the Büchner flask.See the Web Links and Related Questions to the left for more information.
