As the temperature increases, the thermal conductivity of a gas ______A. increasesB. decreasesC. remains constantD. increases up-to a certain temperature and then decreases
Ans: As the temperature increases, the thermal conductivity of a gas INCREASES.
According to the kinetic theory of gases and experimental results, the thermal conductivity of the gas is proportional to the square root of the thermodynamic temperature and inversely proportional to the square root of molar mass.
K ∝ √T
& K ∝ √1/M
In a liquid and gas, the kinetic energy of the molecules is due to their random translational motion and their vibrational and rotational motions.
The higher the temperature, the faster the molecules move, the higher the number of collisions, and the better the heat transfer.