Question

write about thermos flask ​

Answer 1

Answer:

A thermal flask consists of two insulated layers (inner and outer) and trapped between them is a layer of air or simply vacuum in some cases. The main reason behind the construction of a typical flask is to allow minimum heat to escape from the inside to outside and this is done by reducing the heat transfer rates by making the separation between inside and outside to be well insulated.

Answer 2

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A thermos flask, also called a Dewar flask, is a special kind of bottle in which hot liquids like tea and coffee remain hot and cold items like ice or cold water remain cold for a long time. It is also popularly known by other names, such as a vacuum flask or simply a thermos.The thermos flask was originally invented by a Scottish Chemist, Sir James Dewar, in 1892.

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