A constant volume gas thermometer employing ______________ is used to measure sub-zero (i.e., < 0°C) temperature?
Correct answer: D. Helium
- A. None of these
- B. Hydrogen
- C. Nitrogen
- D. Helium
Explanation
Helium remains suitable for gas-thermometer measurements at temperatures below 0°C and is especially useful at very low temperatures because it stays gaseous over a wide cryogenic range. Nitrogen is used over a higher temperature range, while hydrogen has more specialised low-temperature applications.
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