Why is it difficult to measure the coefficient of expansion of a liquid than solid ?
Liquids tend to evaporate at all temperatures
Liquids conduct more heat
Liquids expand too much when heated
Their containers also expand when heated
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-1 – 2017
$V_{observed} = V_{real, liquid} – V_{expansion, container}$
To find the real coefficient of volume expansion of the liquid, one needs to account for the expansion of the container, which itself has a coefficient of volume expansion (or linear expansion, from which volume expansion can be derived). This adds complexity to the measurement process compared to measuring the expansion of a solid rod or block, where the change in length or volume is directly measured.
Option D correctly identifies this key difficulty: the container’s expansion must be factored in.