Topic: Heat Transfer
With rise in temperature thermal conductivity of air
- A. Increases
- B. Decreases
- C. Remains constant
- D. May increase or decrease depending on temperature
Answer: A. Increases
Explanation: Thermal conductivity of air and gases increases with a rise in temperature. This is because air molecules move faster, allowing them to transfer heat more efficiently. By contrast, the thermal conductivity of liquids and most solids generally decreases with an increase in temperature.