Based on Galileo Galilei's discovery that a liquid's density changes with temperature, Galileo thermometers can pinpoint the room's temperature. This handsome, blown-glass thermometer is filled with clear liquid and five glass spheres full of colored liquid. A gold tag dangles from each sphere to indicate a temperature in degrees Fahrenheit.
As the temperature in the room changes, so does the temperature of the liquid surrounding the spheres, changing its density. Because all of the spheres are different densities, they sink or float as the liquid's density changes—some sink to the bottom because they're more dense than the liquid at room temperature, while others float to the top because they're lighter. That means the lowest-floating sphere in the top group is closest to the actual room temperature.
Though it's also useful, the thermometer's real appeal lies in its aesthetic, especially as the temperature changes and the colorful spheres drift up and down. Its beauty and centuries-old history make it a unique gift, office décor item, or period-appropriate prop for a play about the Scientific Revolution.
- Blown glass
- Five glass spheres with colored liquid
- Gold tag indicate temperature in 4-degree increments
- Tells temperature between 60–96 degrees Fahrenheit
- Dimensions: 3"x1.5"x9"
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The Fine Print
Limit 3 per person, may buy 2 more as gifts. Free returns. $2.99 flat-rate shipping fee for purchases less than $14.99. Free shipping for purchases of $14.99 or more. Does not ship to AK/HI/Canada/Puerto Rico. Most orders are delivered within 2 1/2 weeks from the purchase date. Does not ship to PO boxes. See return policy. Must pay applicable tax and provide name and shipping address at checkout, which will be shared to facilitate shipping. Goods sold by Groupon Goods.