Which of the following instruments is not used for measuring sub-zero (<0°) temperatures ?
Correct answer: A. Radiation pyrometer
- A. Radiation pyrometer
- B. Mercury in glass thermometer
- C. Vapor pressure thermometer
- D. Platinum resistance thermometer
Explanation
A radiation pyrometer is primarily used for high-temperature, non-contact measurement and is not the usual instrument for sub-zero temperatures. Platinum resistance thermometers, vapour-pressure thermometers, and suitable liquid thermometers can measure below 0°C within their ranges.
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