Galilei Glass - Thermometer - Polished Brass

117,00 EUR

The instrument is manufactured by Delite in Denmark.

Model/Product no.: DL550701
Stock status: IN STOCK
Shipped immediately
Qty.
GALILEI thermometer (in storm glass housing) in brass



Height 14.5 cm.



Instructions included.



18°C or below = all 4 spheres are together at the top

20°C 3 spheres at the top, 1 sphere at the bottom

22°C 2 spheres at the top, 2 spheres at the bottom

24°C 1 sphere at the top, 3 spheres at the bottom

Above 24°C = all 4 spheres are together at the bottom.
Galileo discovered that the volume of a liquid changes with temperature.



As the temperature increases, the volume of the liquid increases, while the glass spheres hardly change.

As the liquid expands, the density of the liquid decreases.

The buoyancy of the spheres = the mass of the displaced liquid.

As the temperature increases, the ability of the liquid to support the spheres decreases.

The spheres have a few miligrams difference in weight and therefore sink differently depending on the temperature.



The Galilean glass has 4 glass spheres 18, 20, 22 and 24ºC.

At 19ºC the 18ºC sphere can only just float. When the temperature exceeds 19ºC it will sink.

Now the 20ºC sphere will be visible for reading. When the temperature rises

further and passes 21ºC, the 20ºC sphere will sink and the 22ºC sphere will be visible

for reading, etc. Thus, when the temperature is read at 20ºC on the Galilean glass,

the temperature will actually be between 19ºC and 21ºC.



So the temperature is read on the lower of the upper spheres!

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