Question

Which property of liquid is used in making thermometer?

Answer 1

Ethanol-filled thermometers are usedin preference to mercury for meteorological measurements of minimum temperatures and can beused down to −70 °C (-94 °F). The physical limitation of the ability of athermometer to measure lowtemperature is the freezing point of theliquid used.

Answer 2

Mercury is used in thermometer bcoz of its special properties.
It can measure a wide range of temperature from -40 to 356°, and up to 570° under pressure in liquid state.
It expands reqularly, proportional to the absolute temperature changes.