We should mention that the density of the glass bubbles themselves are all the same. * Short lines indicate 0.2 degree. It will expand and contract based on movements in temperature. While you can't tell the exact barometric pressure using this technique, it will allow you to monitor trends. google_color_bg = "FFFF66"; google_color_border = "0066CC"; I'm the lead contributor here at Weather Station Advisor. If the air temperature heats up, the liquid expands, and its density decreases. As the temperature changes, spheres will rise and fall within the glass tube. Instead, it's the medallion counterweights hanging below that are slightly different in weight on each sphere. For more on how they work and how to use them, read on. Finally, while the device can be used outside, it will work best indoors. Each glass bubble has a metal tag with a unique weight, allowing it to float or sink when the liquid's density inside the thermometer changes based on the ambient temperature. Each line on the Fahrenheit scale is two degrees. The spheres in the thermometer take a few minutes to float to the correct places. By teaching children how to read a thermometer, you can help them understand temperature and how it changes and you can show them that they can check the temperature every day by … If the water is high, it indicates lower pressure and bad weather can be expected. Based on the principles of Galileo's work, each instrument allows you to read both the temperature and atmospheric pressure on a beautifully designed desktop stand. You might have seen my work on Digital Trends, PC World, VentureBeat, or even the New York Times website. We think it's an excellent option for those looking for a unique gift for a weather enthusiast. In most Galileo thermometers, this is either every two or four degrees of temperature. You can hang the thermometer inside or outside. Conversely, if the bulbs all sink, then the air temperature is warmer than the reading on the highest tag. The fact that it works makes it that much better. Basically, the spheres will rise when the temperature is cold and sink when it's hot. The ethanol obtains its heat through the ambient air on the outside of the glass cylinder. (The National Weather Service uses data from these AWOS and ASOS stations to bring you your current local … This thermometer shows a temperature of 38 degrees C, 100 degrees F. 4. In between, there will likely be a bulb that is hovering by itself in the gap. google_color_link = "0066CC"; Inside, glass spheres are filled with liquid, and they have a calibrated medallion hanging from the bottom, showing a specific temperature. Reading a Galileo thermometer is quite simple. Each line on the Celsius scale is one degree. As the air temperature cools, the liquid contracts and the density increases. WeatherStationAdvisor.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Based on nearly 400-year-old concepts of physics, this decorative weather instrument actually works. Best Indoor Outdoor Thermometer Reviews in 2020: Top Wireless Models For Your …, 7 Best Remote Vacation Home Monitoring Systems, 7 Best Infrared Thermometer Reviews in 2020. 3. In this case, the temperature is colder than the temperature reading on the lowest medallion. I also have a degree in Journalism from Temple University, and have spent nearly my entire journalism career covering consumer gadgets. 1. My interests lie in severe weather and climate change.