why a thermos flask a) has vacuum between its two glass walls b) is shiny inside and c) is placed in a plastic container
Answers
Explanation:
a)the thermos has vacuum so it can keep the heat inside the flask and then it can be resisted from going directly out.
b)it is shiny because of the metal used.
c)it is not necessary to keep it in plastic container it is kept in plastic container because it is cheap and easy to make.
Answer:
a) Thermos flask has vacuum inside between its two glasses to avoid the heat transfer through radiation ans prevent the liquid kept in the thermos. This is because heat requires a medium to travel and if there is no medium i,e vacuum the heat cannot get transferred.
b)Inside of thermos flask is shiny inside because to reflect almost all the heat which comes on the walls of the thermos container.
c)The thermos flask is a plastic container because plastic is a bad conductor of heat and if the heat falls on the outside walls which are made up of plastic then plastic will not allow the hat to go inside the thermos.
Hence by these features the heat has no chance to go inside the thermos.
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Explanation: