Galileo Galilei Thermometer

Liquid thermometer made based on an idea by Galileo Galilei (1564-1642).
Galileo discovered that liquids change their density depending on the temperature.
When the temperature increases, the density of the liquid in the thermometer decreases.
The relatively heavier glass bulbs lose buoyancy – their ability to float – and sink.
On the other hand, if the ambient temperature decreases again, the lighter spheres gain buoyancy and gradually rise.

Measurement range: 18 °C 26 °C - scale divided by 2°C.

Do not keep exposed to direct sunlight for long