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Alcohol, which is used as a thermometric liquid, has the following characteristic properties : 
1. Alcohol has a very low freezing point of about −112oC and hence is suitable in thermometers to record very low temperatures. 
2. Alcohol has a low boiling point of about 78oC and therefore cannot be used to measure high temperatures. 
3. Alcohol can be colored brightly (by adding a dye, generally red) and then it is clearly visible through glass. 
4. Alcohol expands more than mercury. 
5. Alcohol is fairly inexpensive. 
6. Alcohol wets glass. 
7. Alcohol is not a good conductor of heat. 
Hence alcohol thermometers are used.
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This is because alcohols has very low melting point that is about -112degree C.