Solution:
Concept- For the making of thermometers high thermal expansion coefficient is needed. Many thermometers include mercury. The tools used to measure temperature are called thermometers. The majority of metals are efficient heat conductors. But thermometers almost always favour the material with a high coefficient of thermal expansion.The melting and boiling points of mercury are low. It has a significant thermal or volumetric expansion coefficient. As the temperature rises, the mercury expands. Many thermometers utilise mercury as an indicator.
It is practical to use a liquid to construct a thermometer since the liquid will expand or contract in response to heating and you can measure the temperature with just a ruler. Liquids have a fixed volume but an ambiguous form. Mercury is useful because it is a liquid throughout a wide temperature range around room temperature.
Hence, the correct answer is option 1.
