Limited-time Offer: Save $40 on Geno 2.0! Now only $159.95.    VIEW DETAILS >>
  1. Skip to navigation
  2. Skip to content

21-inch Galileo Thermometer

$60.00

Price: $60.00

Item#:2000379

Qty: This item is out of stock.





You May Also Like

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.


Not available for shipment outside of the 48 contiguous United States. Expedited shipping is not available for these items.


Displays temperatures in Fahrenheit in 2° increments from 68° to 80°. Accurate to within 2°. 21"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
21-inch Galileo Thermometer
 
2.7

(based on 3 reviews)

Ratings Distribution

  • 5 Stars

     

    (1)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (1)

33%

of respondents would recommend this to a friend.

Reviewed by 3 customers

Sort by

Displaying reviews 1-3

Back to top

 
1.0

very nice looking

By MJB

from Mankato, MN

Verified Reviewer

Pros

    Cons

    • Arrived broken

    Best Uses

      Comments about 21-inch Galileo Thermometer:

      have not been able to enjoy product as it arrived broken and have not received a replacement yet

       
      2.0

      21-inch Galileo Thermometer

      By lbn

      from Murrysville, Pa

      Verified Buyer

      Comments about 21-inch Galileo Thermometer:

      My grandson liked it.

      (1 of 1 customers found this review helpful)

       
      5.0

      Great show piece that works perfect

      By Artie50

      from Nashua NH

      Verified Buyer

      Comments about 21-inch Galileo Thermometer:

      excellent piece, looks great in my living room. Only issues was first one was broken (it is glass), they replaced it at no cost to me. NG is great to deal with.

      Displaying reviews 1-3

      Back to top

      Other Products Related to 21-inch Galileo Thermometer

      17-inch Galileo Thermometer
      17-inch Galileo Thermometer
      (Based on 16 reviews)
      Category: Member Products

      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 float in a sealed tube of water where they rise and fall with the temperature and the resulting changes in water density.


      $55.00
      Combination Birdfeeder and Thermometer
      Combination Birdfeeder and Thermometer
      (Got it? Rate it.)
      Category: Home Décor/Birdfeeders and Garden

      A glimpse at the temperature can turn into a morning of watching small backyard birds nibble and flit around this combination thermometer and feeder. The durable UV-stabilized polycarbonate tube resists yellowing even after many seasons outdoors. A secure top and quick-release base make both filling and cleaning a snap.


      $49.00
      $19.99
      National Geographic Kontiki 30-inch Cargo Duffel
      National Geographic Kontiki 30-inch Cargo Duffel
      (Got it? Rate it.)
      Category: Travel/Luggage and Travel Bags

      Whether in classic movies, antique stores, or attics, the sight of battered steamer trunks covered in travel stickers can inspire intense wanderlust. But dragging cumbersome luggage around on an outback safari is a practice best left to centuries past. National Geographic's Kontiki luggage collection captures some of the look and feel of the golden age of travel, but incorporates cutting-edge materials and design to meet the demands of the 21st century.


      $139.95
      National Geographic Explorer 28-inch Collage Luggage
      National Geographic Explorer 28-inch Collage Luggage
      (Based on 1 review)
      Category: Member Products

      Durable, maneuverable, and eye-catching, our hard-side Explorer luggage is a travel-savvy way to show your love of National Geographic. It's full of features that frequent travelers will appreciate. For starters, you'll be able to spot the full-color graphics in an instant whether it's sliding down the baggage claim chute at LAX or strapped to the roof of a bus in Bangalore.


      $159.95
      National Geographic Explorer 20-inch Collage Luggage
      National Geographic Explorer 20-inch Collage Luggage
      (Got it? Rate it.)
      Category: Member Products

      Durable, maneuverable, and eye-catching, our hard-side Explorer luggage is a travel-savvy way to show your love of National Geographic. It's full of features that frequent travelers will appreciate. For starters, you'll be able to spot the full-color graphics in an instant whether it's sliding down the baggage claim chute at LAX or strapped to the roof of a bus in Bangalore.


      $119.95
      National Geographic Explorer 20-inch Polar Bear Luggage
      National Geographic Explorer 20-inch Polar Bear Luggage
      (Based on 1 review)
      Category: Member Products

      Durable, maneuverable, and eye-catching, our hard-side Explorer luggage is a travel-savvy way to show your love of National Geographic. It's full of features that frequent travelers will appreciate. For starters, you'll be able to spot the full-color graphics in an instant whether it's sliding down the baggage claim chute at LAX or strapped to the roof of a bus in Bangalore.


      $119.95
      National Geographic Explorer 28-inch Polar Bear Luggage
      National Geographic Explorer 28-inch Polar Bear Luggage
      (Got it? Rate it.)
      Category: Member Products

      Durable, maneuverable, and eye-catching, our hard-side Explorer luggage is a travel-savvy way to show your love of National Geographic. It's full of features that frequent travelers will appreciate. For starters, you'll be able to spot the full-color graphics in an instant whether it's sliding down the baggage claim chute at LAX or strapped to the roof of a bus in Bangalore.


      $159.95
      National Geographic 8 x 21 Mini-binoculars
      National Geographic 8 x 21 Mini-binoculars
      (Based on 8 reviews)
      Category: Gear & Gadgets/Binoculars and Optics

      At only 6 1/2 ounces, our water-resistant, rubber-armored binoculars are ideal for tossing in your backpack wherever you travel. Individually focusing eyepieces with BAK-4 roof prisms and multicoated lenses increase contrast and resolution and bring birds and wildlife eight times closer. Field of view is 413 feet at 1,000 yards. Focuses on subjects as close as 15 feet.


      $29.95
      National Geographic Northwall 22-inch Rollaboard Luggage
      National Geographic Northwall 22-inch Rollaboard Luggage
      (Got it? Rate it.)
      Category: Member Products

      Travelers come in all kinds, from the super-connected sight-seer who wants to photograph, blog, and "like" every step of the way, to those who look at travel as an opportunity to get away from the routines of every day life—to those for whom travel is their daily routine. No matter what your philosophy or reason for hitting the road, National Geographic's Northwall luggage collection is a perfect choice. Just as suited to commuter flights as trips around the world, these feature-rich pieces help you stay organized and ready to go. Each is made using rugged poly fabric with a stain-and water-resistant coating. The 22" Rollaboard includes the following features:

      • The retractable handle system slides smoothly and has multiple stops so it's comfortable for travelers of any height, in any situation.
      • Durable ball-bearing inline skate wheels provide smooth rolling over any surface and the crash-guard wheel housing with rubber skid guards provides durability.
      • The retractable handle system slides smoothly and has multiple stops so it's comfortable for travelers of any height, in any situation.
      • A four-point stability system helps to prevent a fully packed bag from tipping when upright.
      • A padded front pocket keeps electronics and laptops safe and accessible, which a business organizer in the front pocket stores pens, magazines, files, and more.
      • Interior features include a lid pocket made of rugged PVC mesh, 2 1/2" expansion capacity, and two built-in interior wet pockets for beverages, toiletries, or a wet bathing suit.
      • Four carry handles make it easy to grab the bag from overhead compartments, car trunks, and more.
      • Exterior compression straps provide extra security, while interior compression straps help you fit as much as possible while keeping it secure and minimizing wrinkling of clothes.


      $199.00
      National Geographic Northwall 22-inch Soft Duffel
      National Geographic Northwall 22-inch Soft Duffel
      (Got it? Rate it.)
      Category: Travel/Luggage and Travel Bags

      Travelers come in all kinds, from the super-connected sight-seer who wants to photograph, blog, and "like" every step of the way, to those who look at travel as an opportunity to get away from the routines of every day life—to those for whom travel is their daily routine. No matter what your philosophy or reason for hitting the road, National Geographic's Northwall luggage collection is a perfect choice. Just as suited to commuter flights as trips around the world, these feature-rich pieces help you stay organized and ready to go. Each is made using rugged poly fabric with a stain-and water-resistant coating.


      $79.95
      National Geographic Northwall 32-inch Rolling Duffel
      National Geographic Northwall 32-inch Rolling Duffel
      (Got it? Rate it.)
      Category: Travel/Luggage and Travel Bags

      Travelers come in all kinds, from the super-connected sight-seer who wants to photograph, blog, and "like" every step of the way, to those who look at travel as an opportunity to get away from the routines of every day life—to those for whom travel is their daily routine. No matter what your philosophy or reason for hitting the road, National Geographic's Northwall luggage collection is a perfect choice. Just as suited to commuter flights as trips around the world, these feature-rich pieces help you stay organized and ready to go. Each is made using rugged poly fabric with a stain-and water-resistant coating.

      • Adjustable hold-down straps keep clothing in place and minimize wrinkles.
      • Exterior compression straps adjust to provide increased security.
      • The retractable handle system slides smoothly and has multiple stops so it's comfortable for travelers of any height, in any situation.
      • Durable ball-bearing inline skate wheels provide smooth rolling over any surface.
      • Drop-bottom compartment is perfect for shoes and bulky gear, or you can unzip the divider for a super-spacious bag.
      • Opens like an upright suitcase for the easiest access to all of your gear.
      • Neoprene-cushioned handles make it comfortable to hoist this bag in and out of car trunks or off baggage carousels.


      $219.95
      National Geographic Northwall 26-inch Rollaboard Luggage
      National Geographic Northwall 26-inch Rollaboard Luggage
      (Got it? Rate it.)
      Category: Member Products

      Travelers come in all kinds, from the super-connected sight-seer who wants to photograph, blog, and "like" every step of the way, to those who look at travel as an opportunity to get away from the routines of every day life—to those for whom travel is their daily routine. No matter what your philosophy or reason for hitting the road, National Geographic's Northwall luggage collection is a perfect choice. Just as suited to commuter flights as trips around the world, these feature-rich pieces help you stay organized and ready to go. Each is made using rugged poly fabric with a stain-and water-resistant coating. The 26" Rollaboard includes the following features:

      • The retractable handle system slides smoothly and has multiple stops so it's comfortable for travelers of any height, in any situation.
      • Durable ball-bearing inline skate wheels provide smooth rolling over any surface and the crash-guard wheel housing with rubber skid guards provides durability.
      • The retractable handle system slides smoothly and has multiple stops so it's comfortable for travelers of any height, in any situation.
      • A four-point stability system helps to prevent a fully packed bag from tipping when upright.
      • A padded front pocket keeps electronics and laptops safe and accessible, which a business organizer in the front pocket stores pens, magazines, files, and more.
      • Interior features include a lid pocket made of rugged PVC mesh, 2 1/2" expansion capacity, and two built-in interior wet pockets for beverages, toiletries, or a wet bathing suit.
      • Four carry handles make it easy to grab the bag from overhead compartments, car trunks, and more.
      • Exterior compression straps provide extra security, while interior compression straps help you fit as much as possible while keeping it secure and minimizing wrinkling of clothes.


      $219.00