Chemical Engineering - Heat Transfer - Discussion

Not understanding, please explain it.

An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel. Solids and liquids are both forms of condensed matter; both are composed of atoms in close proximity to each other.

Then why the thermal conductivity decreases with increase in temperature?

Thanks for explaining @Nigam.

Thank you @Gowtham Nanda.

With an increase in temperature, the thermal conductivity of non-metallic amorphous solids generally decreases.

Explanation:
In non-metallic amorphous solids (like glass, polymers), heat is mainly transferred by vibrations of atoms (phonons), not by free electrons as in metals.
As temperature increases, atomic vibrations become more disordered, leading to increased phonon scattering.
This reduces the mean free path of phonons, thus reducing thermal conductivity.

Final Answer:
Decreases with an increase in temperature.