Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by__________________?
Correct answer: D. Filling nitrogen under pressure in the stem
- A. Accounting for the tube expansion
- B. Increasing the diameter of the tube
- C. Using steel tube in place of glass tube
- D. Filling nitrogen under pressure in the stem
Explanation
Pressurising the stem with nitrogen raises mercury's boiling point and prevents the column from breaking down at higher temperatures. This extends the practical range from about 300°C toward 500°C.
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