Measurement of sub-zero Celsius temperature in industry is done most commonly by __________________?
Correct answer: B. Resistance thermometers
- A. Thermocouples
- B. Resistance thermometers
- C. Gas thermometers
- D. Bi-metallic thermometers
Explanation
Resistance thermometers, especially platinum RTDs, provide accurate and stable measurement over the sub-zero industrial range. Gas thermometers are mainly laboratory standards, while bimetallic thermometers are unsuitable for very low temperatures.
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