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The vacuum and silvered surfaces of a vacuum flask's walls are designed to, respectively:

A. Minimize conduction and convection, and prevent radiation.
B. Prevent conduction and convection, and minimize radiation.
C. Prevent conduction and minimize convection and radiation.
D. Minimize conduction and prevent conduction and radiation.

Answer :

Final answer:

A vacuum flask minimizes heat transfer by using a vacuum to prevent conduction and convection, and a silvered surface to minimize radiation. Therefore, the correct option is B: prevent conduction and convection and minimize radiation. The design effectively keeps hot liquids hot and cold liquids cold.


Explanation:

Understanding the Function of a Vacuum Flask


A vacuum flask, also known as a thermos, is designed to keep liquids hot or cold by minimizing heat transfer. The structure of a vacuum flask includes two walls with a vacuum between them and a silvered surface on the inner wall. This design serves specific functions regarding heat transfer:



  • Conduction: The vacuum between the two walls effectively prevents conduction because conduction requires a medium (solid, liquid, or gas) to transfer heat, and the vacuum contains none.

  • Convection: The absence of air in the vacuum also prevents convection, which is the transfer of heat through fluid motion.

  • Radiation: The silvered surface reflects thermal radiation, minimizing heat loss through radiation.


Based on these functions, the correct answer to the question regarding what the vacuum and silvered surfaces accomplish in a vacuum flask is option B: "prevent conduction and convection and minimize radiation." This indicates that the primary job is to eliminate conduction and convection entirely while limiting the effects of radiation.


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