Concept:Thermometer liquids must expand uniformly and respond visibly to small temperature changes.
Explanation:The two liquids frequently used in basic laboratory thermometers are mercury and alcohol.
Mercury is a metal that is liquid at room temperature and expands evenly when heated.
Alcohol also expands uniformly and has the advantage of remaining liquid at very low temperatures.
Water is never used in a thermometer because it does not expand uniformly.
In addition, water freezes at
0∘C, which makes it unsuitable for measuring low temperatures.
Therefore, the correct pair of liquids is mercury and alcohol.
Answer:C. Mercury and Alcohol