Galilei thermometer with 4 balls and gold-plated seals blue

A useful and decorative eye-catcher for business premises, the laboratory, the living room, your office, the practice or the shop window!

While searching for a method for measuring temperature, the important physicist Galileo Galilei, who lived from 1564 to 1642, discovered that the density of a liquid changes depending on the temperature. To make his experiments reproducible, he took four or five glass spheres, filled them with varying amounts of water, sealed them, and now had a reference point for the temperature of his liquid. We use this principle today. The hand-blown spheres of the thermometer are precisely weighed and marked with an indicator. This must be done with great precision because the weight difference between two consecutive spheres is only a few thousandths of a gram. This guarantees a high accuracy of the temperature display of ± 1°C.
If the temperature rises, the spheres fall very slowly to the bottom, and if the temperature falls again, the spheres rise very slowly to the top. The current temperature is read from the seal of the lowest of the spheres floating on top. The production of Galileo's glass-sphere thermometers is complex and almost entirely handcrafted. The fluid is CFC-free, flame-resistant, and does not emit harmful fumes. Made in Germany.

Glass thermometer with water filling according to Galileo

4 balls with gold-plated seals

Color: blue

Measuring range: 18 to 26°C

Height: 280 mm

Weight: 700 g