The manufacturing method of barometer is very simple.

The simple method of making barometer is as follows:

1. Preparation materials: transparent film box, transparent straw, plasticine or glass glue, water and red ink.

2. Punch a round hole on the film box cover, just enough to insert the straw.

This box is half filled with water. To show clearly, you can drop some red ink.

4. Insert the straw into the box cover and suck the water in the box with your mouth, so that the water level inside will rise, but it can't be sucked into your mouth.

5. Block the mouth of the straw by hand, don't let the water level drop, cover the lid tightly and seal the air inside.

6. In order to achieve a good sealing effect, you can use some plasticine or glass glue to stick the gaps between the straw and the lid, and between the lid and the box.

7. Make a mark at the liquid level of the straw, and then according to the change of the liquid level, you can read the change of the external air pressure.

Application of barometer;

Meteorology: Barometer is one of the most important instruments in meteorology, which is used to measure atmospheric pressure and weather changes. By observing the change of air pressure, we can predict the future weather. For example, when the air pressure increases, it will generally bring sunny weather, and when the air pressure decreases, it may appear rainy weather. Barometer can also be used to measure the wind direction, wind speed and other meteorological elements, providing an important basis for meteorological forecast.

2. Physics: In physics, barometer can be used to verify the existence of atmospheric pressure and measure its value. For example, by measuring the atmospheric pressure at different heights, the law of atmospheric pressure changing with height can be verified. In addition, barometer can also be used to measure the pressure of other gases, such as gas pressure in vacuum containers.

3. Engineering: In construction engineering, aerospace and other fields, barometer is used to measure and monitor the change of air pressure to ensure safe and normal operation. For example, in high-rise buildings, barometer can be used to monitor the change of air pressure to avoid the deformation or rupture of the building due to the change of air pressure. In the aerospace field, barometer can be used to measure the height and speed of aircraft or rockets.

4. Health and life: barometer also has certain application value in health and life. For example, people with high blood pressure or heart disease can be equipped with barometer at home to prevent diseases by observing the changes of air pressure. In addition, in daily life, barometer can also be used to measure indoor and outdoor air quality and humidity, which provides convenience for people's lives.