Description of Galileo thermometers and its working

Galileo thermometers are very useful invention of a famous scientist named Galilei Galileo. The history of these thermometers is very old as they depict from their age of existence. Galileo thermometers were invented in the year fifteen ninety and modified in fifteen ninety three. The principle of the modern Galileo thermometers is pretty different from the principle of the first Galileo thermometer. In the historic age that is the period of sixteenth century there was no device to predict the air temperature until this kind physician named Galilei Galileo invented his very famous creation Galileo thermometer which is used in the twenty first century also. These thermometers are still carrying his name in order to respect the great scientist who invented them.

Galileo thermometers consist of sealed vertical glass tubes. These tubes contain a transparent liquid, which is usually water. The inside of the tube is filled with several colorful and bright adjusted glass bubbles. These colorful bubbles or balls float at various levels in the tube. There are few bubbles which tend to float at the top and a few sitting on the bottom. The bubble near top sinking a little, or the bubble near the bottom starting to float, or perhaps the average of those two, indicates the temperature. The bright colors of the floating bubbles are attractive and not related to the functioning of the thermometer. These bubbles are tagged with numerical digits which depicts the air temperature. The glass bubbles usually contain a liquid that is typically some combination of water, alcohol, and coloring. The temperature is assumed to be hot if the balls settle down at the bottom and the temperature is cool if the balls float in the top.