Which one of the following instruments can be used to measure -250°C temperature ?
- A. By using a mercury based thermometer
- B. By using an alcohol based thermometer
- C. By using a clinical thermometer
- D. By using thermocouple based thermometer ✓
Correct Answer: D. By using thermocouple based thermometer
Explanation
Mercury freezes at -39°C and alcohol at -115°C, making them unsuitable. Thermocouple based thermometers can measure extremely low temperatures like -250°C.
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