In cold countries, alcohol is preferred as a thermometer liquid instead of mercury, because
In cold countries, alcohol is preferred over mercury as a thermometer liquid because the melting point of alcohol can be lower. This ensures that alcohol remains liquid at lower temperatures, making it effective for use in cold climates where mercury may freeze, rendering mercury thermometers ineffective.
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The correct answer is option A. In cold countries, alcohol is preferred as a thermometer liquid instead of mercury because the melting point of alcohol can be lower. Mercury freezes at around -39°C, which can be exceeded in extremely cold climates, rendering mercury thermometers ineffective. Alcohol, with a lower freezing point, remains liquid at lower temperatures, making it suitable for use in colder environments. Options B, C, and D are incorrect. Option B is false as alcohol is not a better conductor of heat compared to mercury. Option C is irrelevant to the choice of thermometer liquid. Option D is also irrelevant as the worldwide production of alcohol compared to mercury does not influence its suitability as a thermometer liquid in cold climates. Therefore, option A best explains why alcohol is preferred over mercury in cold countries.