americanJOY17
Galileo Thermometer by Annie Preske
Annie Preske
Natural
"Galileo Thermometer"
This is a close-up image of a Galileo Thermometer. It is a glass tube filled with water and floating glass bubbles containing various liquids. On each individual bubble, there is a metal tag indicating a temperature. Together, a bubble and its metal tag have a slightly different density compared to another bubble and its corresponding metal tag. Each of the bubbles experiences a downward force due to gravity and a buoyant force, or the upward force on a glass bubble produced by the surrounding liquid in which the bubble is submerged.The air temperature outside of the thermometer equals the water temperature, or the liquid surrounding the bubbles. The densities of each bubble remain constant. As the temperature of the water decreases, its density increases. As the surrounding water density changes, each bubble floats or sinks based on the density differences among the glass bubbles. Finally, to read this thermometer, simply look for the lowest floating glass bubble and its metal tag. In this photo, the temperature is 72°, as indicated by the red glass bubble.
Galileo Thermometer by Annie Preske
Annie Preske
Natural
"Galileo Thermometer"
This is a close-up image of a Galileo Thermometer. It is a glass tube filled with water and floating glass bubbles containing various liquids. On each individual bubble, there is a metal tag indicating a temperature. Together, a bubble and its metal tag have a slightly different density compared to another bubble and its corresponding metal tag. Each of the bubbles experiences a downward force due to gravity and a buoyant force, or the upward force on a glass bubble produced by the surrounding liquid in which the bubble is submerged.The air temperature outside of the thermometer equals the water temperature, or the liquid surrounding the bubbles. The densities of each bubble remain constant. As the temperature of the water decreases, its density increases. As the surrounding water density changes, each bubble floats or sinks based on the density differences among the glass bubbles. Finally, to read this thermometer, simply look for the lowest floating glass bubble and its metal tag. In this photo, the temperature is 72°, as indicated by the red glass bubble.