Galileo thermometer

How to Find Your Best Galileo Thermometer

An extremely popular thermometer is the Galileo thermometer.

Galileo Galilei, an Italian engineer, mathematician, and astronomer have discovered the principles behind this type of a thermometer. It is based on the fact that the density of liquid changes is in direct proportion to its temperature. The thermoscope is also based on the same principle.

The Galileo thermometer is made of a glass cylinder that has to be sealed and contains a clear liquid and quite a few glass vessels which vary in mass.

How does a Galileo thermometer work

Buoyancy determines whether objects float or sink in a fluid, and is responsible for the fact that boats made of steel float in water (while a solid bar of steel sinks).
The factor that determines if a massive object rises or falls in a liquid is the object’s density. It sinks since it is heavier than the liquid if the object is denser than the liquid it displaces. Then it starts to sink until the weight of the liquid becomes equal to the weight of the object if the object is denser than the fluid.
Imagine there are two objects, each with a volume of 1 L (0.22 imp gal; 0.26 US gal). The mass of water displaced by an object of this size is 1 kg (2.2 pounds).

Floats fall or rise based on the weight and the density of the liquid when the temperature changes.

Galileo Galilei, an Italian engineer, mathematician and astronomer has discovered the principles behind this type of a thermometer. It is based on the fact that the density of liquid changes is in direct proportion to its temperature. The thermoscope is also based on the same principle.

The Galileo thermometer is made of a glass cylinder that has to be sealed and contains a clear liquid and quite a few glass vessels which vary in mass.

Floats fall or rise based on the weight and the density of the liquid when the temperature changes.

galileo thermometer broke

The brown object on the left is floating because the mass of water it would displace if completely submerged (1 kg (2.2 pounds)) is larger than the mass of the object. It floats half submerged since that is the point at which the mass of the water displaced (0.5 kg (1.1 lb)) is equal to the mass of this object. The green object on the right has sunk because the mass of water it is displacing (1 kg (2.2 pounds)) is less than the object’s mass (2 kg (4.4 pounds)).
All items made from the material above will sink. In Figure 2, the object’s interior has been hollowed out. The total mass of the object is currently 0.5 kg (1.1 lb), however, its volume remains the same, so it floats halfway out of the water such as the brown object in Figure 1.

galileo thermometer amazon

In the examples above, the liquid in is assumed to be water. Water has a density of 1 kilogram per liter (8.3 lb/US gal), meaning the mass of water displaced by any of the aforementioned objects when completely submerged, is 1 kg (2.2 lb).
Galileo discovered that the density of a fluid is a function of its temperature. This is the key to the way the Galileo thermometer functions: since the temperature of increases, their density decreases.
Figure 3 shows a 1 kg (2.2 lb) hollow object made of the green material. At the left-hand container, the density of the liquid is 1.001 kg/L (8.35 lb/US gal). It floats because the object weighs less than the water it displaces. In the right-hand container, the density of the liquid is 0.999 kg/L (8.34 lb/US gal). It sinks since the object weighs more than the mass of the water it displaces. This shows that changes in the density of the liquid can result in an almost-floating object to sink.

galileo thermometer Walmart

At the Galileo thermometer, the glass bulbs are full of colored liquids. The composition of these liquids is not vital for the functioning of the thermometer; they merely function as fixed weights and their colors are for decoration. Their densities are adjusted by means of the metal tags hanging from under them, once the bulbs are sealed. Any expansion because of the temperature change of the liquid and air gap inside the bulbs does not affect the performance of the thermometer, as these materials are sealed inside a glass bulb of fixed size. The clear liquid where the bulbs are submerged is not water, but some organic compound (like ethanol) the density of which changes with temperature more than water does. Changes affect the density of the liquid that is clear that is outer and this results in the bulbs to rise or sink. We also offer infrared thermometers.

hanging Galileo thermometer

The weight and size of each bulb are adjusted so that they do not jam together, either by being at least half the size of the tube diameter to retain their stacking order or, as an alternative, far less than the tube diameter to openly pass each other in the tubes.

Did you read this Wikipedia article yet? Read it now or learn more about our grill thermometer.

Read More

galileo thermometer