The Galileo Thermometer is probably the most fascinating and beautiful way to measure the ambient temperature. An eye-catcher for any room.
It is based on a discovery by Galileo Galilei about 400 years ago. Galileo was an Italian Physicist, Mathematician, Engineer, Astronomer and Philosopher who played a major role in the scientific revolution. Searching for a way to measure exact temperatures, Galileo discovered this fascinating method. He placed several exactly weighted balls in a cylinder filled with a certain liquid. He found that the balls rose or fell according to the temperature. By this method, he was able to determine the current temperature.
How it works:
The thermometer works on the principle that the density of a liquid changes as the temperature varies. Each of the glass balls is exactly weighted by partially filling them with liquid. When the temperature rises, the liquid in the glass cylinder becomes less dense, and the heavier balls sink slowly to the bottom.
How to read:
Place the thermometer on a flat surface. The lowest floating ball within the group at the top of the cylinder tells the current temperature.