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QPage 11: Q5: HC Verma: Concepts of Physics - Volume 2 Heat and Temperature Page 11: Q5 Solution: Can the bulb of a thermometer be made of an adiabatic wall?

⚠️ Common Exam Traps & Conceptual Pitfalls

Do not assume a sealed thermometer bulb can be adiabatic; the device must permit heat flow so its sensor reaches thermal equilibrium with the object. An adiabatic wall blocks heat transfer, preventing any temperature reading.

Can the bulb of a thermometer be made of an adiabatic wall?

Step-by-Step Verified Solution

**Answer:** No, the bulb of a thermometer cannot be made of an adiabatic wall. **Step-by-Step Explanation:** A thermometer must exchange heat with the body until thermal equilibrium is reached. An adiabatic wall prevents heat exchange entirely. If the bulb were adiabatic, heat could not flow into the thermometer, and it would never reach the temperature of the body being measured. The bulb must be made of a conducting material.

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