0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
Should you use a flask which is a good conductor of heat or poor conductor to keep the tea inside the flask warm?
a poor conductor of heat. a good conductor of heat will allow the heat to pass though the flask and escape cooling the tea. so a poor conductor just to clarify.
Why are shiny outer surfaces needed in a vacuum flask?
The outer surfaces do not need to be shiny. The interior ones do, to reflect heat back rather than let the heat pass out of the vacuum flask. The vacuum between the double walls of the flask also reduces heat loss.
What is silvering in a vacuum flask?
There is a silvering in the vacuum flask in order to reduce the loss of heat through the means of radiation.
Why is the inside of a thermos flask silver?
To reduce heat loss by thermal radiation.
Why should you never heat a flask when sealed with a cork?
increased pressure and temperature
What is the function of a bottom flask?
It is used to heat liquids or to made chemical reactions.
Why the outer body of inner bottle of thermos flask is made silver in colour?
because the take heat heat inside and not allowed it heat to get outside
Vacuum is mantained in thermos flask?
The vacuum reduce heat loss by conduction and convection.
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.
What is a vacuum flask made of?
A vacuum flask is a type of flask that aims to stop all three forms of heat transfer. Conduction, convection and radiation. A vacuum flask prevents conduction by making a vacuum between the inside and the outside layer of the flask, so that the only solids that touch are the lid and the main body of the flask. This means the amount of conduction that occurs is minimised. One major drawback though, is when the hot water transfers heat with the cold air inside the flask, then the hot air transfers heat with the cold lid, and then on the likely chance that the lid is hotter than the surroundings, the lid transfers heat with the air molecules around it. This means that a considerable amount of heat is lost to the surroundings. The only way convection can occur is by the hot liquid or solid transferring heat with the trapped air inside the flask, although this only affects the temperature of the water by a bit, because most of the liquid condenses again. The flask is made so that radiation is reflected back of the sides, which is made of a shiny material. Also, the flask is not transparent; it is made of an opaque material, usually plastic or metal. The only way radiation can escape, is by the lid being taken off.
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.
How does a flask reduce heat loss by conduction and radiation?
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.
How is heat loss by convection prevented in a thermal flask?
There is a layer of vacuum which surrounds the flask, then the inside is covered by shiny material which will reflect the heat back into the flask, there are two lids, and there is an indirect gap of about 0.01mm.
What Are Some Objects That Minimize Heat Transfer?
The vacuum flask otherwise known as a thermos flask
Why pear shaped flask is used instead of round bottom flask?
even distribution of heat
Should you use a flask which is a good conductor of heat or poor conductor to keep the tea inside the flask warm?
a poor conductor of heat. a good conductor of heat will allow the heat to pass though the flask and escape cooling the tea. so a poor conductor just to clarify.
Must a flask be a good conductor of heat?
so as to keep the flask hot hereby keeping the hot water inside the flask hot.
