How Does a Thermos Flask Keep Warm?

Answer

A thermos works using the concept of a vacuum whereby heat cannot travel through vacuum. A vacuum is created between the inner and the outer wall of the flask. Technically speaking, this space is not really a vacuum, but it has a lower atmospheric pressure than the air around the flask thus the flask retains its heat.
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4 Additional Answers
A thermos flask works by preventing forms of heat transfer. It prevents conduction through the vacuum between the outside and inside layer of the flask. It prevents radiation by having the inner side made using a shiny material. It also prevents convection through a tight lid.
A thermos uses the principle concept of a vacuum. A vacuum is defined by its having absolutely no air, particles or anything with in it. Because it has 'nothing', a vacuum has no thermodynamic uses for it can't transfer heat in either direction. Since there's no matter to transfer the heat through, heat will remain in place when confronted with a vacuum.
A thermos uses the principle concept of a vacuum. A vacuum is defined by its characteristic of having absolutely no air, particles or anything with in it. Because it has 'nothing', a vacuum has no thermodynamic uses for it can't transfer heat in either direction. Since there's no matter to transfer the heat through, heat will remain in place when confronted with a vacuum.
A thermos flask works by creating a vacuum between two glass containers, which will help to maintain the temperature of the inner container. The plug in the flask is a non-conductive material, which also helps to maintain the temperature within the flask, and there is a protective metal or plastic cover for the two containers.
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