Thermal conductivity of air with rise in temperature
A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease depending on temperature
Answer: Option A
Solution(By Examveda Team)
As the temperature of air increases the molecular diffusion also gets increases and in case of air,Thermal conductivity is directly proportional to the lattice vibration and molecular diffusion and hence as the temperature increases the thermal conductivity of air increases.
Related Questions on Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in
A. Melting of ice
B. Boiler furnaces
C. Condensation of steam in condenser
D. None of these
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in
A. Electric heater
B. Steam condenser
C. Boiler
D. Refrigerator condenser coils
The radiation emitted by a black body is known as
A. Black radiation
B. Full radiation
C. Total radiation
D. All of these
Join The Discussion