A mercury thermometer cannot be used to measure the temperature below the freezing point of mercury, which is _____________ °C?
Correct answer: A. -38.9
- A. -38.9
- B. -11.9
- C. -60.9
- D. -80.9
Explanation
Mercury freezes at approximately −38.9°C, so a mercury thermometer cannot provide a liquid-column reading below this temperature. This is why option a is the standard limit for mercury-in-glass thermometers.
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