Question

The space between the inner walls of a thermos bottle is evacuated to minimize heat transfer by:
This question has multiple correct options
(A) Conduction
(B) Radiation
(C) Convection
(D) All of the above

Answer 1

Hint To answer this question, we need to first evaluate the various mentioned options for this question. After the definition of the processes we can make out the difference among the various mentioned options and choose the correct one. The process of heat transfer between substances during the process of conduction, convection and radiation are different.

Complete step by step answer
We should know that the space between the inner walls of a thermos bottle is evacuated to minimize the heat transfer by the process of conduction and convection.
The process of conduction is defined as the process by which the heat or even electricity can be directly transmitted through a material of a specific substance as soon as there is the occurrence of a difference of temperature or in case of electricity if there is a difference in the electrical potential between the corresponding regions, without the movement of the concerned material.
By convection we mean that it is a process by which there is transfer of heat by the movement of the heated fluid, which can include air or even water. This process results in the expansion of most fluids when it is heated.

Hence the correct answer are option A and option C.

Note In the question we have mentioned two processes conduction and convection. However, in order to know the meaning we need to be aware of the difference between them as well. By conduction we mean when there is the transfer of heat energy with the help of direct contact between the substances. On the other hand, when we talk about convection, we mean that there will be the movement of heat with the actual motion of the matter.