The primary function of a thermos flask is to keep liquids hot or cold. There is an outer protective layer with a hollow area inside before the actual area where the liquid is stored. Heat or cold gets trapped in the hollow area and that is what keeps a liquid hot or cold.
Silver is a great heat and light reflector. That means if you store cold water in a thermos, the heat from outside cannot get into the thermos easily because the heat is reflected by the silver color of the thermos.
It depends entirely on the size of your thermos. They come in different volumes.
It depends on the size and volume of the Thermos. A family Thermos may have a capacity of 2 litres (~8 cups), a personal Thermos can be 0.5 litres (~2 cups).
you tell me if you fill a thermos with hot soup or hot chocolate put the lid on and then touch it is it hot or cold. odds are it is warm so it is hard to say. but the thermos is an insulator
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.
out of steel
inside a thermos is flask steel materials, it keeps the thermos for about 1 - 2 days.
The vacuum reduce heat loss by conduction and convection.
A Thermos.
Thermos flask or vacuum flask.
Yes. The thermos flask can reduce the amount of heat travelling from the surroundings to the cold water
The vacuum flask otherwise known as a thermos flask
There is air between the inside and outside of the flask.
A flask is basically a thermos that is used to hold liquids (beverages) that are meant to be kept warm.
Thermos flask is a thermos container used to store liquids like any hot drink. The liquid added to thermos flask will retain the temperature even after some time irrespective of external temperatures.
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.
As the flask is closed air tight, no convection current is possible.