The Galileo thermometer consists of a quality sealed glass tube that is filled with water and several floating bubbles. The tube features a thick, glass base and an interesting, decorative top. The bubbles are glass spheres filled with a colored liquid. Attached to each bubble is a little golden metal tag that indicates the temperature (Fahrenheit). It’s a beautiful way to demonstrate pressure and fluid principles on your desk or in your home!
Why is it called a Galileo Thermometer?
It is thought that Galileo is responsible for describing how an object can show changes in thermal energy through the invention of the thermoscope.
How the Galileo Thermometer works
An object immersed in a liquid is affected by two primary forces – gravity pulling it down and buoyancy pushing it up. The bulbs have almost the same density as the water in the tube. They will sink as the density changes, the temperature of the water (and thereof the room) is the bulb at the bottom of the floating bulbs and above the bulbs that have sank.
The Galileo Thermometer works because water expands or contracts when the temperature changes. Water is actually less dense as a solid as compared to when it is a liquid because of hydrogen bonding. However, when it does not have a change in state and stays a liquid, it actually gets denser as it gets colder, and sinks. Thus, the colder the water gets, the more bulbs float to the top of the thermoscope.
• Comes with a Teacher’s Guide
• Approx. 13″ (330 mm) H