The thermometer employs the principles of buoyancy and density. The body of the Galileo Thermometer is mostly filled with paraffin and any remaining air is removed from the tube. This allows the paraffin to expand and contract as needed and isolates it from air pressure which can affect thta density of liquids. As the temperature of the paraffin falls and it becomes denser, the baubles will rise. Each bauble is carefully weighted so that they will swap from floating to sinking at a particular temperature, giving you a reading.

Accurate temperature

Hand Blown Glass

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