Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of ______________ as mercury does not amalgamate with it?
Correct answer: B. Stainless steel
- A. Copper
- B. Stainless steel
- C. Copper alloys
- D. Monel
Explanation
Stainless steel is used for the bulb and capillary because mercury does not readily amalgamate with it, allowing reliable pressure measurement. Copper and many copper alloys are unsuitable because mercury readily forms amalgams with them.
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