Which among the following is/are the reasons behind using Mercury in thermometers ?
- 1. Mercury does not wet the inner sides of the thermometer.
- 2. It can be seen easily in a thin capillary tube of the thermometer.
- 3. It is a good conductor of heat.
- 4. It is non-toxic.
Select the correct answer using the code given below :
1 only
1 and 2 only
1, 2 and 3
3 and 4
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CAPF – 2010
Mercury possesses several properties suitable for use in thermometers: 1) It has high surface tension and does not wet (stick to) the glass tube, allowing for accurate readings of the meniscus. 2) It is opaque and reflective, making the column easily visible against the glass. 3) It is a good conductor of heat, which facilitates faster transfer of heat from the object being measured to the mercury, allowing it to quickly reach thermal equilibrium. 4) Mercury is highly toxic, which is a disadvantage, not a reason for its use.