Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C ?
Correct answer: D. Bimetallic thermometer
- A. Mercury thermometer
- B. None of these
- C. Radiation pyrometer
- D. Bimetallic thermometer
Explanation
A bimetallic thermometer is suitable for approximately -40 to 425°C and is mechanically simple for moderate temperature measurement. Radiation pyrometers are preferred for much higher or inaccessible temperatures, while mercury thermometers have a narrower practical range.
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