how does a galileo thermometer work? - metal name tags

Based on the thermometer that Galileo invented in the early 1600, your co-
The worker's desk is called a Galileo thermometer.
A simple, fairly accurate thermometer, today it is mainly used as a decoration.
The Galileo thermometer consists of sealed glass tubes filled with water and several floating bubbles.
Bubbles are glass balls filled with colored liquid mixtures.
This liquid mixture may contain alcohol or it may be just water with edible pigments.
Each bubble has a small metal label that represents the temperature.
Numbers and degree symbols are engraved on the label.
These metal labels are actually assigned weights for calibration.
The weight of each label is slightly different from other labels.
Because bubbles are handmade.
Blown glass, they are not exactly the same size and shape.
The bubbles are calibrated by adding a certain amount of fluid to the bubbles so that they have exactly the same density.
Therefore, after the weighted label is attached to the bubble, the density of each label is slightly different (
Ratio of mass to volume)
Compared to other bubbles, the density of all bubbles is very close to the density of the surrounding water.
If you have read the question, then you know that objects immersed in the fluid experience two major forces: the pull-down of gravity and the upward push of buoyancy.
What makes this thermometer work is the downward action of gravity.
The basic idea is that as the temperature of the air outside the thermometer changes, the temperature of the water around the bubble also changes.
When the temperature of the water changes, it either expands or shrinks, thus changing its density.
So, at any given density, some bubbles float and others sink.
The bubble with the largest sink indicates the approximate current temperature.
Consider this example: Suppose there are five bubbles in the thermometer: blue bubbles (60 degrees)
Is the heaviest (densest)
Bubbles, after which each bubble is slightly lighter, the red bubble is the lightest.
Now, suppose the temperature of the room is 70 degrees.
Because the surrounding air is 70 degrees, we know that the water inside the thermometer is about 70 degrees.
Bubbles in blue and yellow (
60 degrees and 65 degrees, respectively)
They have a higher density than water at this temperature, so they sink.
The density of purple and red bubbles is lower than the surrounding water, so they float on the top of the thermometer.
Since the green bubble is calibrated to represent 70 degrees, the same temperature as the water, it sinks slightly in order to float below the purple and red bubbles-
Thus showing the temperature of the room!