- glass jar
- stationery gum or scotch tape
- bamboo skewer or straw
- colored paper for arrows and scales
- office clip clothespin
We pull the ball on the neck of the jar and fasten it firmly with rubber or tape.
Glue a paper arrow on the tip of the bamboo skewer
Glue the second end of the stick to the ball using tape
In a clothespin we insert a strip of cardboard the height of a jar on which we will make a scale.
|This is our homemade barometer.|
|Measurement of atmospheric pressure using a homemade barometer|
Oh, Tatyana, we don’t keep up with you to do everything))). At least set aside a day and immediately organize the entire weather station))). Very interesting idea, thanks!
The main place for all these devices to find))) We have already turned the balcony into a branch of the meteorological center)))
Is it really that simple and it works? Since childhood, I thought that inside the barometer there is a very complex and incomprehensible mechanism, a bunch of gears, springs and gadgets)))
You were right in some ways - there are indeed springs and nuts inside the mechanical barometer so that the needle shows the pressure reliably and correctly. And the pressure itself is measured in it with an iron box, from which air is pumped out. As in our bank, the walls of the box are pressed in at high pressure, and at low pressure they bulge out. And it registers the device. Of course, the mechanical barometer is much more reliable - after two weeks the membrane from the ball already stretched very much, lost elasticity and the barometer stopped showing correctly (((And to the old Soviet one, at least henna)))
It is not always possible to buy a barometer, so I want to propose the design of a home barometer, which will show atmospheric pressure with some accuracy.
The barometer (see figure) consists of a bottle with transparent glass, a glass tube and cork. One-third of the bottle is filled with water, it is better to take distilled water, because the usual blooms in a year. 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 it remains to plug the bottle with a stopper. The barometer is ready. When atmospheric pressure begins to change, the water level in the tube will change. If air bubbles start to come out of the tube, then the pressure is very high, and this is to clear stable weather, at such a time there is a good bite. If water begins to pour out through the top of the tube, the pressure is low, you can wait for the storm, but you should not go fishing.
Such a barometer can be made of a small tin oiler with parallel sides.
Pick a cork that would tightly close the only hole of the future barometer. Before you put the cork in place, you need to make a hole of such a diameter in it that a transparent tube-straw for cocktails is passed through it. However, it is better to use a glass tube with an inner hole diameter of 1.5 - 2.0 mm.
The 2/3 capacity is filled with tinted water, a tube with a stopper is inserted into the hole, while
should contain a little of the same tinted water. With increasing atmospheric pressure, the liquid level in the tube will rise, and vice versa.
Fix such a 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 tinted water and installing the tube plug, add some water to the tube. Since the body of the barometer is rigid, with increasing pressure the water level will decrease, with decreasing it will increase.
Light bulb barometer
Take a blown electric light bulb and where the base begins with the threaded part, carefully drill a small hole with a diameter of 2-3 mm. This should be done very carefully, otherwise the balloon may crack or break.
Here is the easiest way to drill glass. At the point where you marked the hole, apply a drop of machine or sunflower oil. Take abrasive powder from medium-sized sandpaper and sprinkle it on an oil drop to make a viscous paste that is slightly softer than a toothpaste. Then clamp the copper wire in the drill chuck. Its diameter should correspond to the size of the hole you want to drill. Grip the lamp base gently. And wrap the glass flask with a towel or rag. Drilling must be done very carefully with minimal effort.
When the hole is drilled, fill it with tap water, filling the glass flask to half. Then add two to three drops of ink or a slice of the chemical pencil lead and mix. The barometer is ready.
It remains to wait until the inner wall of the flask dries, and hang the barometer between the window frames. It is best from the north side, where direct sunlight will not fall on it. 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 for a day quite fully. Continuous or variable cloud cover awaits us, or it will rain, light, lingering, short-term, maybe thunderstorm.
True, you need to know some features in order to decipher the testimony:
If the inner walls light bulbs covered with small drops of condensed water - tomorrow it will be overcast, but without precipitation.