Here's the breakdown:
* Galileo Galilei (1564-1642) observed that objects of different densities float at different levels in water. He experimented with this principle, leading to the development of a rudimentary "thermoscope" in the early 17th century.
* The modern Galileo thermometer as we know it with its sealed glass bulbs and colored liquids was likely developed sometime in the 17th or 18th century. However, there's no definitive inventor credited.
* The term "Galileo thermometer" became popular in the 19th century, associating the device with Galileo's earlier work.
So, while Galileo's work laid the groundwork for the thermometer's development, the specific design we know today emerged later, with its exact origins remaining unclear.
