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Answer :
Final answer:
A Thermos bottle prevents heat transfer through conduction, convection, and radiation. It uses a vacuum to minimize conduction and convection, and reflective coating to reduce radiation.
Explanation:
Three ways in which a Thermos bottle inhibits heat transfer are by reducing conduction, convection, and radiation. A Thermos bottle, or vacuum flask, consists of two flasks, one inside the other, separated by a vacuum. This vacuum space minimizes heat transfer by conduction and convection, as both require a medium (solid, liquid, or gas) to transfer heat. The inner surface of the flasks is coated with a reflective material to reduce heat loss or gain by radiation, which is the transfer of energy by electromagnetic waves.
Heat transfer by conduction is when heat is passed directly through a substance when there is a difference of temperature between adjoining regions, without movement of the material. As for convection, it is the transfer of heat by the physical movement of a fluid (such as air or water) from one place to another. Finally, radiation is the transfer of heat through electromagnetic waves, such as the heat from the sun reaching the earth.
In the case of a Thermos bottle, the vacuum acts as an insulator, the reflective surface bounces back heat trying to escape, and the design of the bottle prevents heat from easily moving in or out, keeping the contents hotter or colder for longer periods.
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