To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with ________________?
Correct answer: A. Air
- A. Air
- B. A metal powder or graphite
- C. Oil
- D. Mercury
Explanation
Air is a poor heat-transfer medium and creates a large thermal resistance between the bulb and thermal well, slowing response. Oil, metal powder, or graphite can improve heat transfer across this clearance.
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