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17-inch Galileo Thermometer

$55.00

Price: $55.00

Item#:1075151

Qty: Available, ready to ship.





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Art meets science in this colorful glass thermometer. In 1593, Italian physicist Galileo invented a thermometer based on the principles of relative density. Individually calibrated weights containing a mixture of ethanol and dye float in a sealed tube with de-aromatic oil where they rise and fall with the temperature and the resulting changes in liquid density.


Displays temperatures in Fahrenheit in 2° increments from 68° to 80°. Accurate to within 2°. 17"H.

In the 2nd century B.C., Greek scholar Archimedes discovered the law that states any object in a fluid displaces its own weight of fluid. He went a step further when he described the principle of buoyancy—that if an object is more dense than an equal volume of water, it sinks; if it's less dense, it floats. A simplified way of understanding density in this example is that it's the relative "heaviness" of objects of the same volume—a marshmallow is less dense than a marble of the same size and shape.


Almost 2,000 years later, Italian scientist Galileo discovered that a liquid's density is affected by changes in temperature. As temperatures rise, a liquid's density decreases. This means that objects that float in room temperature water would sink as the water is heated. He applied his discovery to create what is now known as a Galileo thermometer.


In a Galileo thermometer, sealed glass bubbles filled with a mixture of ethanol and dye have weights attached that are marked with different degrees Fahrenheit. The bubbles are suspended in a tube of de-aromatic oil. The weights give the bubbles different densities from each other and from the liquid in the tube.


When the atmospheric temperature rises, the density of liquid in the tube decreases, which changes the relative density of the glass bubbles. So, as the temperature increases, the liquid's density decreases, which means more bubbles will sink because they are now more dense than the surrounding liquid. At the highest temperatures, the lightest (least dense) bubble will finally sink. When temperatures drop, the opposite happens and more bubbles rise.


To read a Galileo thermometer, look at the lowest hanging bubble in the middle of the tube—the one that is not entirely sunk, nor entirely floating at the top. This bubble is in equilibrium with the surrounding liquid, and its tag will tell the current temperature.


REVIEW SNAPSHOT®

by PowerReviews
17-inch Galileo Thermometer
 
4.0

(based on 21 reviews)

Ratings Distribution

  • 5 Stars

     

    (11)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (3)

80%

of respondents would recommend this to a friend.

Pros

    Cons

      Best Uses

          • Was this a gift?:
          • No (4), Yes (3)

        Most Liked Positive Review

         

        Galileo Thermometer

        I have a Galileo at home, got it from a yard sale, did'nt know what it was until I saw it in NG order catalog,I just liked it so I got it....Read complete review

        I have a Galileo at home, got it from a yard sale, did'nt know what it was until I saw it in NG order catalog,I just liked it so I got it. It really works, I tryed it tonight in my home.I can't find anything wrong with it.

        VS

        Most Liked Negative Review

         

        Galileo Disappointment

        My thermometer arrived with a broken ball inside. I was very disappointed and called right away as it was to be a Christmas gift for my Dad. They acted like this was a common...Read complete review

        My thermometer arrived with a broken ball inside. I was very disappointed and called right away as it was to be a Christmas gift for my Dad. They acted like this was a common thing for these to arrive broken (how could they NOT? They are ALL GLASS and full of LIQUID!) and said that another would be shipped right out. In all the busy-ness of the holiday I had to get my dad another gift because the replacement never arrived. I just called yesterday because I noticed my credit card was never refunded for the shipping, only the item itself. I was told these are on backorder till 1/15/12. That would have been nice to have known. I told them to cancel the order :-( Too bad, too...because I know someone who has one of these thermometers and it is the coolest! I'd recommend buying one at a store if at all possible. Too risky to order such a fragile item from a catalog.

        Reviewed by 21 customers

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        Displaying reviews 1-10

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        5.0

        I would give this product as a gift!

        By Pat

        from Atherton, CA

        Verified Buyer

        Pros

        • BEAUTIFUL
        • Fun to watch
        • Tells The Temp

        Cons

        • NOT VERY STABLE
        • will break if dropped

        Best Uses

        • Tell Temp
        • very pretty

        Comments about 17-inch Galileo Thermometer:

        This is a beautiful piece of art that also tells the temp. You just have to put it somewhere where it will not get knocked over and our of the reach of kids. I love the product and would purchase another one.

        • Was this a gift?:
        • No
         
        4.0

        Stylish,great bookshelf piece!

        By Majorprm

        from U.S.

        Verified Buyer

        Pros

          Cons

            Best Uses

              Comments about 17-inch Galileo Thermometer:

              Buy for decorating more than function.

              • Was this a gift?:
              • Yes
               
              1.0

              Does not work correctly

              By Bozo Bob

              from Daytona beach , Fl

              Verified Reviewer

              Pros

                Cons

                  Best Uses

                  • Got It To Replacea
                  • Got It To Replace One Tha

                  Comments about 17-inch Galileo Thermometer:

                  not accurate. temperature is 3 degrees colder than all other instruments in the home. I purchased this to replace one that was broken by accident. The first one was great.( it was a gift from my son )

                  • Was this a gift?:
                  • No
                   
                  3.0

                  Temperature range too narrow

                  By skier Bob

                  from Whitefish, Montana @ 4613 feet

                  Verified Buyer

                  Pros

                  • Attractive
                  • Quick shipping

                  Cons

                  • Comfort Zone 60-75 Degree
                  • Does Not Show Low Temps
                  • House Kept 60 In Winter
                  • Lowest Temp 68 Degrees
                  • Night Temps Go To 55 Degr

                  Best Uses

                    Comments about 17-inch Galileo Thermometer:

                    When the snow falls, the wind blows, and the cabin chills. Room temperature is a big item. Should we turn up the fireplace? Grab an extra blanket? Hot tea, anyone? Having a temperature range of 68 degrees to warmer temps does not do it for dwelling on a mountain. Want a range of 55 degrees to 75 degrees, please. Thermostats are for wusses.

                    • Was this a gift?:
                    • Yes

                    (2 of 2 customers found this review helpful)

                     
                    4.0

                    Decrative and useful

                    By Byrddog

                    from Texas

                    Verified Buyer

                    Pros

                    • Pleasant In Appearance

                    Cons

                      Best Uses

                        Comments about 17-inch Galileo Thermometer:

                        Its basically "Eye Candy". Have seen them before and always wanted one. Like it very much.

                        • Was this a gift?:
                        • No

                        (2 of 2 customers found this review helpful)

                         
                        4.0

                        A piece of galileo in your home!

                        By Fullmoonwalker

                        from New Rochelle, NY

                        Verified Buyer

                        Pros

                          Cons

                            Best Uses

                              Comments about 17-inch Galileo Thermometer:

                              Useful within the home but not outside due to limited temperature range.
                              Still, a satisfying, marvelous inventive way of gauging the temperature

                              • Was this a gift?:
                              • Yes

                              (3 of 3 customers found this review helpful)

                               
                              5.0

                              This is fascinating!

                              By Bubbe

                              from Surprise, AZ

                              Verified Buyer

                              Pros

                              • Is Fun To Watch Balloons

                              Cons

                              • none

                              Best Uses

                              • For Decor And Temp

                              Comments about 17-inch Galileo Thermometer:

                              It is fairly accurate and is a decorative piece of science from the past. It is fun to watch the balloons change with the temperature.

                              • Was this a gift?:
                              • No

                              (2 of 4 customers found this review helpful)

                               
                              1.0

                              pack it properly

                              By Paul the horse man

                              from Ohio

                              Verified Buyer

                              Comments about 17-inch Galileo Thermometer:

                              first thermometer came with broken degree bulb inside of tube so it did not work - sent it back

                              second thermometer came completing broken, oil everywhere UPS put it in black garbage bag and left on steps.

                              Need to learn how to safely package this thermometer for shipping!!!

                              (2 of 2 customers found this review helpful)

                               
                              5.0

                              The Super, Intriguing Un-thermometer!

                              By Dano the Mano

                              from Toronto, Ontario, Canada

                              Verified Buyer

                              Pros

                              • Conversation piece
                              • Fascinating for Kids
                              • Quality construction
                              • Visually Intriguing

                              Cons

                              • No Celcius
                              • Only Fahrenheit

                              Best Uses

                                Comments about 17-inch Galileo Thermometer:

                                A Great Gift, but you'll want to keep it for yourself. Even the beautifully shaped, quality, glass cylinder and floating glass bulbs are a beautiful site that will put you in a trance. Enjoy!

                                (1 of 1 customers found this review helpful)

                                 
                                5.0

                                Unique gifts

                                By Shambles

                                from Tuscaloosa, AL

                                Verified Buyer

                                Comments about 17-inch Galileo Thermometer:

                                This was a gift to my sister. It was shipped to her, so I didn't actually see it but she and her husband have it proudly displayed in their beautiful kitchen! I wish it had been available gift wrapped, but that's not really important.

                                It's the second (but not the last) gift I've purchased from the NatGeo store. Great stuff!

                                Displaying reviews 1-10

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