The interrelationship between thermal conductivity, dynamic viscosity and temperature of gas can be described as
Options:
(A) dynamic viscosity and thermal conductivity decrease as temperature increases
(B) dynamic viscosity decreases and thermal conductivity increases as temperature increases
(C) dynamic viscosity and thermal conductivity decrease as temperature decreases
(D) dynamic viscosity and thermal conductivity increase as temperature decreases
Official Answer Key:
C
Step-by-Step Solution & Explanation
By kinetic theory of gases, both viscosity and thermal conductivity arise from molecular momentum/energy exchange, which intensifies with molecular speed — so both properties increase with temperature for a gas (opposite of liquids). Equivalently, both decrease as temperature decreases, which is option (C).
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