This thermometer includes red, orange, green and blue glass bubbles with engraved metal tags to indicate the temperature. The temperature range for this thermometer is 60-96 Fahrenheit. Also, if all the balls are at the top then the temperature is the lowest ball or lower, OR if all the balls are on the bottom then the temperature is the highest ball or higher.
How it works:
This Thermometer works on the principle of buoyancy and density. Galileo discovered that the density of a liquid changes with the temperature. For most liquids as temperature increases, density decreases. By putting precisely weighted objects in the liquid Galileo was able to observe the objects floating and sinking to different depths at different temperatures. As the density in the liquid increases, the balls begin to float higher. When the density decreases the balls begin to sink to the bottom.
Hand Blown Glass
Made in China
Item # GEGL13
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