Anleitung für ein Galileo-Thermometer. Eine der vielen wichtigen Beobachtungen, die der italienische Astronom und Physiker Galileo Galilei gemacht hat, war, dass sich die Dichte der Flüssigkeit mit Temperaturschwankungen ändert - ausdehnt und zusammenzieht.
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Part 1 of 2:Positioning the Thermometer
Identify the temperature stamped onto each medallion. The thermometer consists of a glass tube filled with a clear liquid, in which colored glass spheres float. Each sphere has a metal medallion hanging from it. The medallions are different weights, which makes the spheres float or sink different amounts.
Look closely at each metal medallion. You will see a temperature engraved onto it.
Different Galileo thermometers have different ranges of temperatures that they can report. For example, many have a range of 60 °F (16 °C) to 100 °F (38 °C) and won't tell you the temperature if it's higher or lower than those values. Note that the spheres sink when it's hot out and float when it’s cool. The Galileo thermometer works because of the principle of buoyancy, which states that objects that are denser than their surroundings sink, and objects that are less dense than their surroundings float. The temperature surrounding the thermometer will make the liquid in the thermometer more dense as it cools, or less dense as it heats up. The spheres will sink when the temperature is hot, and float when the temperature is cool.
The spheres also contain liquid, but it changes density much less rapidly than the clear liquid in the thermometer, so it isn’t affected by the temperature change.
The spheres are different colors just to look beautiful. Hang the thermometer from a hook to find out the air temperature. You can hang the thermometer inside or outside. The key is to not hold the thermometer in your hands because your hands will warm it up and give a skewed reading. The spheres in the thermometer take a few minutes to float to the correct places.
Keep in mind that Galileo thermometers are not super precise. They’ll be able to tell you roughly the temperature of the room, within 4 °F (−16 °C). Their main benefit is that they're beautiful, with all those floating glass spheres. Place the thermometer in a beaker of water to test the water temperature. This is a good way to demonstrate using the thermometer, especially if you’re doing it in a classroom. Full a big beaker with water that’s either colder or warmer than the ambient temperature of the room. Then put in the Galileo thermometer.
Using a beaker of water is great for a classroom demonstration because the temperature change between the air and the water makes for a dramatic show.
Part 2 of 2:Reading the Temperature Properly
Read the temperature of the sphere floating in the middle of the tube if there is one. Sometimes a cluster of spheres floats by the top of the tube, and a cluster sinks to the bottom, while one sphere hangs in the middle. If that’s the case, read the temperature tag on the middle sphere.
This is the most common scenario. Average the lowest and highest spheres if there isn't one in the middle. In some cases, there will be 2 groups of spheres hanging out, 1 in the top of the tube and 1 in the bottom. If that’s the case, read the temperature of the lowest sphere in the top group and the highest sphere in the bottom group. Take the average by adding them together and dividing by 2. That’s your temperature.
For example, if one sphere says 72 and one says 68, your average temperature would be 70. Mark the temperature as colder than the highest sphere if they all float. When the outside temperature is quite cold, all of the spheres will float toward the top of the tube. Read the temperature on the highest of the floating spheres. The ambient temperature is colder than that reading.
The spheres float because the liquid inside the tube becomes denser than the spheres. Note that the temperature is hotter than the lowest sphere if they all sink. The Galileo thermometer doesn’t measure accurately at really high temperatures. All the spheres will sink toward the bottom of the tube, and all you’ll know is that the temperature is hotter than the one on the medallion of the lowest sphere.
The spheres sink in high temperatures because as the liquid in the tube heats up, it becomes less dense than the spheres.
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Galileo’s early thermoscope was the basis for and is still used as a working model, for the widely used temperature measuring device that has come to be known as a Galileo Thermometer. The Galileo Thermometer. While based on the original model and design of Galileo’s Thermoscope, the modern Galileo Thermometer has very little in common with ...
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Jun 16, 2015 . Marcus Kundisch erklärt in einem Wetter-Spezial, wie das Galilei-Thermometer funktioniert. Wettervorhersagen, Messwerte, Radar, Blitzanalyse und vieles mehr ...
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A Galileo 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 …
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Mar 31, 2019 . Although the original inventor/s of the Galileo Thermometer is unknown, it is named after the legendary scientist due to his discovery that the density of a liquid responds to changes in temperature. The Galileo Thermometer may be a much more complex instrument, but it is based on the thermoscope that Galileo invented as a result of his theory.
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This fairly accurate instrument is based on the thermoscope invented by Galileo Galilei in the early 17th century. Unlike your typical mercury-in-glass thermometer that’s basically a …
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Aug 10, 2018 . The Galileo thermometer consists of a sealed glass tube that is filled with water and several floating bubbles. The bubbles are glass spheres filled with a c...
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May 18, 2015 . This observation led to the development of the Galileo thermometer, a glass tube full of liquid and liquid -filled glass spheres each using a designated temperature reading. These thermometers that are simple, straightforward and lovely are as easy as they may be to set up, to read. Instructions 1. Hang your Galileo thermometer inside and from a hook.
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Inexpensive: A small, basic Galileo thermometer with five bulbs costs around $25. Mid-range: Most Galileo thermometers cost between $25 and $50, with options in terms of the number of …
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Lily's Home Round Galileo Thermometer, A Timeless Design That Measures Temperatures from 60ºF to 84ºF with a Beautiful Cherry Finished Wood Frame, 7 Multi …
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Jun 10, 2014 . Galileo Thermometers – How they work and how to read them. As far as temperature measurements go, the most beautiful way to measure it is with a Galileo Thermometer. The attractive glass tubes with floating balls that change over time and temperature ever so slowly and gracefully.
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Glass Galileo Thermometer with Colored Glass Spheres in Wood Box Fact Frame Zeckos 5 out of 5 stars (1,155) $ 39.99 FREE shipping Add to Favorites Blackswan Storm Glass blackswanhourglass 5 out of 5 stars (123) $ 42.39 FREE shipping Bestseller ...
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The first thermometer was invented by Galileo around 1593, based on the premise that air expands due to heat and contracts due to cold. However, it was not until 1714 that Gabriel Fahrenheit invented the first reliable mercury thermometer that is still in use today.
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Lily's Home Galileo Thermometer, A Timeless Design That Measures Temperatures from 64ºF to 80ºF, 5 Multi-Colored Spheres (11 Inches) 4.7 out of 5 stars. 718. $24.95.
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Große de luxe-ausführung • Ungefährliche, ungiftige Flüssigkeit. Alle teile aufwendig handgearbeitet • Mit stabilem Standsockel. Vintage-thermometer - außerdem relevant oder passend zu: Temperatur, Classic, Messgerät, Retro, Sturmglas, Goethe, Dekoration, groß. Empf. 35 mm. Jahrhunderts vom italienischen Physiker Galileo Galilei entwickelt, versetzt es noch heute viele ins Staunen.
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Aquarium Thermometers manufacturers, service companies and distributors are listed in this trusted and comprehensive vertical portal. The comprehensive directory provides access to full contact and ability information for sourcing professionals, engineers and researchers wishing to get information on Aquarium Thermometers.
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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...
To read the ambient temperature on a Galileo thermometer is very easy. What you have to do is simply look at the lowest ball that is floating while ignoring those tags that had sunk to the bottom of the container. It's those balls that float or are neutrally buoyant that interest us.
The clear liquid inside the Galileo thermometer is not water, but is another liquid, typically ethanol, whose density varies with temperature more than the density of water does. This makes it more sensitive to temperature changes which makes it a better predictor for temperature than water.
Das Galileo-Thermometer ("Galileisches Thermometer") besteht aus einer zylindrischen Glasröhre, die mit Flüssigkeit (Öl-Alkohol-Mischung) gefüllt ist.
Galileo Thermometer. An ihnen hängt ein Metallstück, das ganz genau abgewogen ist und bewirkt, dass die Dichte der Glaskugel mit Metallhänger dem des Wassers entspricht. Erwärmt sich die Flüssigkeit im Zylinder, ändert sich ihre Dichte, da sie sich ausdehnt. Damit beginnt eine vorher schwebende Glaskugel zu sinken,...
Diese Art von Thermometer wurde vom Großherzog Ferdinando II. de’ Medici erfunden, der 1654 auch das erste Thermometer mit Alkohol als Messflüssigkeit erfunden hat.