温度計を開発したのは誰？
Various authors have credited the invention of the thermometer to Hero of Alexandria. The thermometer was not a single invention, however, but a development.
Hero of Alexandria (10–70 AD) knew of the principle that certain substances, notably air, expand and contract and described a demonstration in which a closed tube partially filled with air had its end in a container of water. The expansion and contraction of the air caused the position of the water/air interface to move along the tube.
Hero of Alexandria