Galileo Thermometer - 17-in

Product Features

• This Galileo color ball thermometer is an ornamental work of art under the invention of Galileo (1564-1642). 
• In a cylinder filled with liquid, there are several color balls, which go up and down with the change in temperature.
• The lowest of the floating color balls in the upper part of the cylinder indicates the reference temperature.
  
• Measures temperatures from 60-96° F with 10 balls

What is a Galileo Thermometer?

A Galileo thermometer (or Galilean thermometer) is a thermometer made of a sealed glass cylinder containing a clear liquid and several glass vessels of varying density. The individual floats rise or fall in proportion to their respective density and the density of the surrounding liquid as the temperature changes. It is named after Galileo Galilei because he discovered the principle on which this thermometer is based—that the density of a liquid changes in proportion to its temperature.