Galileo Thermometer 28cm.

$24.00 incl GST

In stock

SKU: hj-6180 Categories: , Tags: ,


Galileo Thermometer 28cm.

This 28cm high Galileo Thermometer has 6 balls. This small thermometer is accurate for a temperature range between 18C and 28C.




In the Galileo thermometer, the small glass bulbs are partly filled with different-coloured liquids. The composition of these liquids is not important for the functioning of the thermometer; they merely function as fixed weights and their colours are only for decoration. Once the bulbs have been sealed, their effective densities are adjusted by means of the metal tags hanging from beneath them. Any expansion due to the temperature change of the coloured liquid and air gap inside the bulbs does not affect the operation of the thermometer, as these materials are sealed inside a glass bulb of fixed size. The clear liquid in which the bulbs are submerged is not water, but some organic compound (such as ethanol) the density of which varies with temperature more than water does. Temperature changes affect the density of the outer clear liquid and this causes the bulbs to rise or sink.