Chapter 9, Problem 15RQ

Does a good insular prevent heat from getting through it, or does it simply slow its passage?

To determine

Whether a good insulator prevent heat from getting through it, or slows it passage.

Answer to Problem 15RQ

A good insulator prevent heat by slowing its passage.

Explanation of Solution

When the heat from the material flows from one end to the other, that is along the length of the material, then it is known as conduction. This occurs due to the collision of the particles existing in the material, which helps heat to move in the material. The substance which does not allow the heat to move through it is known as an insulator. The main cause of the movement of heat is due to loosely held electrons.

In case of insulators, electrons are closely packed because of which a large amount of heat is needed to break the bond of the electron. Since the electrons are tightly packed, the movement of heat energy within the substance is much slower as compared to conductors. Thus, a good insulator prevents heat by just slowing the passage of heat.

Conclusion:

Therefore, a good insulator prevent heat by slowing its passage.