Greater the value of _______ of a material, the more rapidly it will conduct heat.

Question

Question

This question was previously asked in

RRB ALP Fitter 23 Jan 2019 Official Paper (Shift 3)

Answer 1

Explanation:

Thermal conductivity (k):

Thermal conductivity, (k), is the property of a material that indicates its ability to conduct heat.
\(Q= -\frac{{kA\Delta T}}{b }\) (K= coefficient of thermal conductivity)
where Q = heat is transferred, b is the distance and A is the area of the surface, and \(\Delta T \) is the change in temperature.
It appears primarily in Fourier's Law for heat conduction.
When one end of a metal rod is heated, heat flows by conduction from the hot end to the cold end. In this process, each cross-section of the rod receives some heat from the adjacent cross-section towards the hot end.
The intermolecular space is much larger as well as the motion of the molecules is more random in fluid and gaseous states than in the solid state.
In a solid state, the intermolecular spaces are very close to each other and have more kinetic energy in them.
Therefore thermal energy transport in liquid and gas is less effective than in solid.
This finally makes a conclusion that Solid has more thermal conductivity.
The greater the value of the Thermal conductivity of a material, the more rapidly it will conduct heat.