Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing ?
Correct answer: D. Helium
- A. None of these
- B. Nitrogen
- C. Hydrogen
- D. Helium
Explanation
Helium is preferred for sub-zero gas thermometry because it remains gaseous at much lower temperatures and behaves nearly ideally over a wide low-temperature range. Its low boiling point makes it more suitable than nitrogen for low-temperature measurement.
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