Question

5. The thermos flask is made up of a double-walled glass vessel because glass is a
A. good conductor of heat.
B. poor conductor of heat.
C. fluid.
D.poor insulator.​

Answer 1

Answer:

good conductor of heat

Explanation:

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Answer 2

B. poor conductor of heat.

(A thermos flask is made up of a double-walled glass vessel with vacuum between the walls. Glass being a poor conductor of heat, reduces the transfer of heat from inside the flask as well as outside of it)