The heavier the material, the more efficient it is as a conductor. True or False?

The statement is generally considered true because, in most cases, heavier materials, particularly metals, have a higher density, which allows for a greater number of charge carriers (like electrons) to be present in a given volume. This increases their ability to conduct electricity. Materials with higher atomic weights tend to have more free electrons that promote better conductivity.

Moreover, in the context of thermal conductivity, heavier materials also tend to conduct heat better due to the more significant interaction between their atoms, facilitating the transfer of energy. However, it's important to note that while heaviness can correlate with conductivity for some materials, the intrinsic properties of the material—such as its crystal lattice structure and bonding—are crucial in determining actual conductivity.

Consequently, although there can be exceptions and specific conditions under which different materials might behave differently, the general principle holds that heavier materials are often more efficient conductors, validating the accuracy of the assertion.