A gas thermometer is more sensitive than a liquid thermometer because of a gas :
(1) is lighter than liquid
(2) expands more than a liquid
(3) is easy to obtain
(4) does not change state easily
Answer: (4) Gas is easily compressed so it would have a more versatile range of measurement at least in our atmospheric conditions. The liquid is not so easily compressed, so, very little pressure via mass w/ gravity or heat would cause it to quickly jump between changes. A gas thermometer measures temperature by the variation in volume or pressure of a gas. One common apparatus is a constant volume thermometer. Gas thermometers are often used to calibrate other thermometers.
