Advantages of using mercury in a thermometer

Advantages of mercury are:

1. It is opaque and shining. Hence , it is easily visible through the glass.

2. It does not wet the glass.

3. It has a low freezing point  and a high boiling point. It can be used over a wide range of temperatures.

4. It is a good conductor of hest, so it quickly absorbs heat to attain the temperature of the object.

5. It has a wide range of temperature expansion.