The manufacturing process of a simple barometer is as follows: first take out a transparent glass bottle and pour in an appropriate amount of colored water. Next, close the sealed plug and insert a long, thin glass tube. Then, gently blow a small amount of gas into the bottle from the top end of the thin glass tube so that the liquid level in the tube is slightly higher than the liquid level in the bottle. In this way, a simple barometer is made.
The principle of a simple barometer is an interesting phenomenon that involves the action of atmospheric pressure and the fluidity of liquids. When we look closely at the simple barometer, we can see that the liquid column in the thin tube is higher than the height of the liquid level inside the bottle. It's like a naughty child playing with a water column, and the child jumps up and the water column is pushed higher. In the same way, the pressure of the gas inside the bottle and the pressure of the outside atmosphere are in a game.
In this game, the pressure of the gas inside the bottle and the pressure of the outside atmosphere are pitted against each other in an attempt to control the liquid column. In the end, however, it is the gas pressure inside the bottle that wins, pushing the liquid column to a higher position. This process is actually a physical phenomenon that involves the action of atmospheric pressure and the fluidity of liquids.
We can apply this principle to our daily lives. For example, when we need to measure air pressure, we can use a simple barometer. By looking at the height of the liquid column in the tube, we can infer the current air pressure situation. In addition, this principle can also help us understand other physical phenomena, such as the basic principles of hydrostatics.
In conclusion, the principle of a simple barometer is an interesting and practical physical phenomenon. By understanding this principle, we can better understand the role of atmospheric pressure and the fluidity of liquids, and apply them to everyday life and scientific research.
When the outside air pressure becomes low,The air pressure difference between the inside and outside of the bottle will become largerIn order to maintain balance, the liquid column in the thin tube is pushed higher by the air pressure inside the bottle. 
It is worth mentioning that this type of barometer has obvious flaws. For example, when you hold a bottle in your hand, the liquid column will also rise. That's because the gas in the bottle is easy to expand when heated, which will cause the air pressure in the bottle to increase, and the liquid column will rise.
If you want to talk about a standard barometer, you still have to rely on the "Torricelli experiment".
In the great invention of 1670, Moreland succeeded in creating the world's first mercury barometer. Its measuring principle is derived from the wisdom of Torricelli's experiments. This barometer cleverly uses the mercury pressure in a glass column placed upside down in a mercury tank to balance it with the surrounding atmospheric pressure. This equilibrium mercury pressure is an accurate indicator of how we measure atmospheric pressure. It is worth noting that a standard atmospheric pressure is exactly equal to a column of mercury 76 centimeters high.
When this barometer is used, the higher the outside air pressure, the higher the mercury column, and the first temperature has less effect. Barometers based on this principle are widely used due to their high accuracy.
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