It is not always possible to buy a barometer, so I would like to propose the design of a home barometer that will show atmospheric pressure with some accuracy.
The barometer (see picture) consists of a clear glass bottle, a glass tube and a stopper. The bottle is filled one third with water; it is better to take distilled water, since regular water blooms after a year. The water can be slightly tinted. A hole is made in the cork into which a glass tube is inserted. The junction is covered with plasticine. Now all that remains is to plug the bottle with a cork. The barometer is ready. When the atmospheric pressure begins to change, the water level in the tube will change. If air bubbles begin to come out of the tube, then the pressure is very high, and this means clear, stable weather; at such times there is a good bite. If water starts pouring out of the top of the tube, the pressure is low, you can expect a storm, but you shouldn't go fishing.
METHOD 2:
Such a barometer can be made from a small tin oil can with parallel sides.
Select a plug that will tightly cover the only hole of the future barometer.Before you put the stopper in place, you need to make a hole in it that is large enough to fit a clear cocktail straw tube through it. However, it is better to use a glass tube with an internal hole diameter of 1.5 - 2.0 mm.
The container is filled 2/3 with colored water, a tube with a stopper is inserted into the hole, and in the tube
should contain a little of the same colored water. As atmospheric pressure increases, the liquid level in the tube will rise, and vice versa.
The barometer (see picture) consists of a clear glass bottle, a glass tube and a stopper. The bottle is filled one third with water; it is better to take distilled water, since regular water blooms after a year. The water can be slightly tinted. A hole is made in the cork into which a glass tube is inserted. The junction is covered with plasticine. Now all that remains is to plug the bottle with a cork. The barometer is ready. When the atmospheric pressure begins to change, the water level in the tube will change. If air bubbles begin to come out of the tube, then the pressure is very high, and this means clear, stable weather; at such times there is a good bite. If water starts pouring out of the top of the tube, the pressure is low, you can expect a storm, but you shouldn't go fishing.
METHOD 2:
The simplest do-it-yourself barometer
Such a barometer can be made from a small tin oil can with parallel sides.
Select a plug that will tightly cover the only hole of the future barometer.Before you put the stopper in place, you need to make a hole in it that is large enough to fit a clear cocktail straw tube through it. However, it is better to use a glass tube with an internal hole diameter of 1.5 - 2.0 mm.
The container is filled 2/3 with colored water, a tube with a stopper is inserted into the hole, and in the tube
should contain a little of the same colored water. As atmospheric pressure increases, the liquid level in the tube will rise, and vice versa.
Mount this barometer on a stand with a vertical ruler. You can calibrate it by taking readings from a real barometer.
Instead of a metal container, you can use any small glass bottle. After filling with colored water and installing the stopper with the tube, add some water into the tube. Since the barometer body is rigid, when pressure increases, the water level will decrease, and when pressure decreases, it will increase.
3 METHOD:
Barometer made from a burnt out light bulb 
Instead of a metal container, you can use any small glass bottle. After filling with colored water and installing the stopper with the tube, add some water into the tube. Since the barometer body is rigid, when pressure increases, the water level will decrease, and when pressure decreases, it will increase.
3 METHOD:
Take a burnt out electrical light bulb and where the base with the threaded part begins, carefully drill a small hole with a diameter of 2-3 mm. This should be done very carefully, otherwise the container may crack or break.
Here is the easiest way to drill glass. Apply a drop of machine or sunflower oil to the point where you marked the hole. Take abrasive powder from medium-grit sandpaper and add it to a drop of oil to create a viscous paste, slightly thinner than toothpaste. Then clamp the copper wire into the drill chuck. Its diameter should match the size of the hole you want to drill. Gently clamp the lamp base in a vice. Wrap the glass flask in a towel or rag.You need to drill very carefully, using minimal force.
Once the hole is drilled, pour tap water into it, filling the glass flask halfway. Then add two or three drops of ink or a piece of crayon lead to it and mix. The barometer is ready.
All that remains is to wait until the inner wall of the flask dries out and hang the barometer between the window frames. It is best from the north side, where it will not receive direct sunlight. If the windows face south, install at the top of the window. After a few hours, you can take readings. Our barometer can predict the weather 24 hours in advance quite completely. Overcast or partly cloudy weather awaits us, or there will be light lingering short-term rain, maybe a thunderstorm...
True, you need to know some features in order to decipher the readings:
If the inner walls light bulbs covered with small drops of condensed water - tomorrow it will be completely cloudy, but without precipitation.
Here is the easiest way to drill glass. Apply a drop of machine or sunflower oil to the point where you marked the hole. Take abrasive powder from medium-grit sandpaper and add it to a drop of oil to create a viscous paste, slightly thinner than toothpaste. Then clamp the copper wire into the drill chuck. Its diameter should match the size of the hole you want to drill. Gently clamp the lamp base in a vice. Wrap the glass flask in a towel or rag.You need to drill very carefully, using minimal force.
Once the hole is drilled, pour tap water into it, filling the glass flask halfway. Then add two or three drops of ink or a piece of crayon lead to it and mix. The barometer is ready.
All that remains is to wait until the inner wall of the flask dries out and hang the barometer between the window frames. It is best from the north side, where it will not receive direct sunlight. If the windows face south, install at the top of the window. After a few hours, you can take readings. Our barometer can predict the weather 24 hours in advance quite completely. Overcast or partly cloudy weather awaits us, or there will be light lingering short-term rain, maybe a thunderstorm...
True, you need to know some features in order to decipher the readings:
If the inner walls light bulbs covered with small drops of condensed water - tomorrow it will be completely cloudy, but without precipitation.
If the walls of the light bulb are covered with medium-sized drops, and vertical dry stripes have formed between them, it means partly cloudy.
and the walls are partially covered with large drops of dew - expect short-term precipitation. And from top to bottom and the drops, enlarged, flow down - there will be a thunderstorm.
Large drops are only at the surface of the water, and the neck of the light bulb is dry - the rain will pass away, 30-60 km from your place.
It’s raining outside the window, and the walls of the light bulb have become completely dry, without fog or droplets - tomorrow the weather will be excellent.
And if dew drops appear only on the north side of the cylinder, expect rain tomorrow afternoon.
Of course, such a barometer can only be used if the air temperature is above zero, that is, in spring, summer and early autumn.
Do you remember? You can now surprise your family and compete with professional meteorologists.
It’s raining outside the window, and the walls of the light bulb have become completely dry, without fog or droplets - tomorrow the weather will be excellent.
And if dew drops appear only on the north side of the cylinder, expect rain tomorrow afternoon.
Of course, such a barometer can only be used if the air temperature is above zero, that is, in spring, summer and early autumn.
Do you remember? You can now surprise your family and compete with professional meteorologists.
