If your 6-10 year old child loves experiments and enjoys attending science shows and master classes, it’s time to do some experiments at home. Don't worry: we won't blow anything up. However, these home experiments in chemistry and physics are also very vivid - the results can not only be seen, but also touched and even felt with the tongue. And then decide whether you need whole .

Isaac Asimov said: “You can teach children about science well, or you can teach it badly. If it’s bad, then the kids will hate it for the rest of their lives, and that’s worse than if they didn’t know anything about science at all.”

As a homeschooling parent, I almost made the same mistake. One day I decided that we needed to do science, and began teaching children based on a third-grade textbook. We all hated these classes and soon began to look for daily excuses not to study. About halfway through the year, I stopped our formal science classes. From that moment on, science stopped being boring. Science is everything we do, from observing the phases of the moon to building sand castles, from blowing bubbles to baking cookies.

Let the egg float

This activity will help your child understand the concept of density and why objects sink or float.

You will need:

• 2 clean glasses
• marker
• tea spoon
• 2 eggs

Experience. Fill one glass halfway with water. Mark the water level with a marker. Add salt one spoon at a time and stir until it dissolves. When the salt stops dissolving, do not add any more.

See what happened to the water level when you added salt. The level should not rise; on the contrary, the water becomes denser when it is saturated with salt. When you dissolve salt in water, you push more molecules into the water without giving the water any more space.

Fill the second glass halfway with water. Slowly drop an egg into each glass. An egg will float in salt water, but will sink in plain water.

Explanation. Salt water is denser than the egg, so it floats on it. But plain water is less dense, so it cannot hold the egg, and it sinks.

Amazing way to inflate a balloon

In both chemistry and cooking, different ingredients are mixed to create something new. In cooking, certain ingredients, such as yeast and sugar, are necessary to create a new product because an important chemical reaction occurs between them. This activity will show your child how yeast works.

You will need:

• 3 tbsp. l. Sahara
• ½ cup warm water
• 3 small packets of dry yeast
• 1 empty plastic bottle
• balloon
• rubber

Experience. Let your child dissolve sugar in water. Stir in the yeast and pour the mixture into a bottle. Pull the base of the ball over the neck of the bottle and secure with a rubber band. Place the bottle in a warm place, for example, next to a radiator. After some time, the balloon will begin to inflate. Why?

Explanation. Yeast cells eat sugar and produce a gas called carbon dioxide. It is heavier than oxygen, so it forces air up the bottle into a ball. The same thing happens during cooking. In this case, the released carbon dioxide helps the dough rise.

This activity will show you how batteries produce electricity.

You will need:

• iron paper clip
• lemon
• copper wire

Experience. Have your child straighten the paperclip and insert one end into the lemon. Remove the insulation from both ends of the wire and insert one end into the lemon. Take the outer ends of the paper clip and wire and bring them to your tongue at the same time. You will feel a tingling sensation caused by electricity.

Explanation. How it works? You have created an electric battery. The battery requires two types of metal and acid. A paperclip and a wire are two metals, and a lemon produces citric acid. Water conducts electricity, so your wet tongue completes an electrical circuit when you apply wires to it.

Rubber egg

Chemical reactions constantly occur in our body. If your child forgets to brush his teeth, this at-home experiment will show him how holes can form in his teeth.

You will need:

• small container
• vinegar
• chicken bone

Experience. Have your child place the egg in a small container and fill it with vinegar. Leave it on for 24 hours. Pour in the vinegar and carefully remove the egg. Squeeze it. The acid from the vinegar dissolved the minerals that were in the shell, making it soft as rubber.

Repeat this experiment with a chicken bone. After 3-4 days it will become elastic.

Explanation. Bacteria in our mouths produce an acid that dissolves the enamel on our teeth, just as acetic acid dissolved the minerals in the shell and pit. Remind children to brush their teeth to clear bacteria from their mouth and keep their teeth healthy and strong.

Candy crystals

You will need:

• 2½ cups sugar
• 1 cup water
• saucepan
• thick thread
• button with big holes
• pencil
• glass or glass jar

Experience. Help your child mix the sugar and water in a saucepan and cook the syrup over medium heat until it boils. Leave to simmer for 4 minutes without stirring, then remove from heat and let cool for a minute.

Thread the thread through the button and tie tightly. Tie the other end of the thread to a pencil. Leave a few centimeters between the pencil and the button.

Pour the syrup into a glass. After this, do not touch the glass because it will be very hot. Place a pencil across the top of the glass. The button should be immersed in syrup. Once the glass has cooled, place it in a safe place where you can easily observe the process for about a week.

Check your syrup. First, you will see small crystals forming on the thread. Then they will turn into large pieces that can be broken off and eaten.

Discussion

I think my eldest will like it :) Let's do experiments this weekend... :)

Comment on the article "Experiments for children: a lemon battery, a rubber egg and 3 more experiments"

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1

Zarytova T.N. (Tuymazy, MBOU secondary school No. 8)

1. Alekseev S.V. "Workshop on ecology." – Moscow, 1996.

2. Galpershtein L.Ya. “Funny physics” “Know and be able.” – Moscow, 1994.

3. Grinin A.S., Novikov V.N. "Industrial and household waste: storage, disposal, processing." – Moscow, FAIR PRESS, 2002.

4. Kasyan A.A. "Modern environmental problems." – Moscow, 2001

5. Kuvykin N.A., Bubnov A.G., Grinevich V.I. "Hazardous industrial waste." – Ivanovo, 2004.

6. Rogers K., Clark F., Smith A. “Light. Sound. Electricity". – Moscow: “Rosmen”, 2002.

7. Chuyanov V.A. "Encyclopedic Dictionary of a Young Physicist." – Moscow: “Pedagogy”, 1984.

8. Yarygin V.M. "Biology". – Moscow: “Higher School”, 2004.

9. Encyclopedia “History of Discoveries”. – Moscow: “Rosmen”, 1997.

10. Encyclopedia “To the young erudite about everything.” – Moscow: “Swallowtail”, 2008.

11. URL: http://eko-jizn.ru/

12. URL: http://www.sdaybattereyku.rf/

Man as a biological species influences nature no more than other living organisms. However, this influence is incomparable with the impact that it has on nature through its economic activities. Since we happen to live in the 21st century, we come across batteries every day - in the TV remote control, in electronic watches, in children's toys and flashlights. Once again, while changing the batteries on my calculator, I noticed an icon depicted on the battery body in the form of a crossed out trash can. It turns out that the battery should not be thrown into the trash. What then to do with it?

We think that few people have thought about this problem, because it would not occur to anyone that a small shiny battery is a source of colossal danger, both for humans and the environment as a whole.

The relevance of the work lies in the fact that, in modern conditions of a high level of development, not everyone knows how to dispose of used batteries and what harm they can cause to humans and their environment.

The purpose of the study is to study the danger factors of improper disposal of batteries and to inform classmates and acquaintances about the rules for using batteries.

Research objectives:

1. Study literature and online resources on the topic of the research work.

2. Conduct experiments with a battery to test the hypothesis.

3. Determine the consequences of improper storage and disposal of batteries.

4. Identify the attitude of others towards this problem.

5. Develop a reminder on the use of batteries.

Object of study: AA battery

Subject of the study: the negative impact of harmful substances contained in batteries on the environment and human health when batteries are disposed of improperly.

Research base: students, their parents

Hypothesis: we assume that used and improperly disposed AA batteries are harmful to the environment. We also assume that there is a problem with battery disposal.

Research methods: analysis of materials from electronic and printed sources on the problem under study, conversations with specialists from government agencies, surveys of students, experiments to identify the harmful effects of substances contained in the battery on living nature; experiments in a chemistry classroom to assess external effects on the battery ;analysis, generalization and systematization of results.

The practical significance lies in the possibility of using these materials during lessons and extracurricular activities with primary school students.

Based on the results of the study, recommendations for the use and disposal of batteries were drawn up.

Theoretical study of the AA battery

General idea of ​​AA batteries and the history of their origin

At the beginning of our research, we decided to find out where the battery came from, what it consists of, and what it contains that makes its presence among general garbage dangerous.

Back in 1791, the Italian doctor Luigi Galvani made an important observation, but he failed to interpret it correctly (Fig. 1). Galvani noticed that the body of a dead frog shudders under the influence of electricity - if you put it near an electric machine, when sparks fly out of it. Or if it just touches two metal objects. But Galvani thought that this electricity was in the body of the frog itself and called this phenomenon “animal electricity.”

The Italian scientist Count Alessandro Volta in 1800 repeated Galvani's experiments, but with greater accuracy (Fig. 2). He noticed that if a dead frog touched objects made of one metal - for example, iron - no effect was observed. For the experiment to be successful, two different metals were always required. And Volta concluded that the appearance of electricity is explained by the interaction of two different metals, between which a chemical reaction is formed. He alternately placed silver and zinc circles in a column, insulated with felt pads, the element is called a voltaic column.

AA batteries, their composition and impact on the environment

Batteries, or batteries as we used to call them, have different shapes: finger, “little finger”, “barrel”, crown, “tablet”, etc. (Fig. 3). Their operating principle is the same. We will consider a AA battery because it is the most commonly used in everyday life.

This battery is so called because it is finger-shaped. The battery itself is 2 cylinders inserted into each other. Between these cylinders there is a special solution, a paste-like substance or powder. These solutions, pastes, and powders contain various chemicals. The ions in these substances move, and an electric current arises, moving from one cylinder to another. This sets our cars in motion, from which the flashlights light up and the flashes work (Fig. 4).

Batteries are classified according to the predominance of a particular metal in its contents. This is how manganese-zinc (salt), alkaline (alkaline), mercury, silver and lithium batteries are distinguished. The most widely used by consumers are salt and alkaline (alkaline) AA batteries (Fig. 5). Looking at an ordinary AA battery, you can always see a sign in the form of a crossed out trash can. This means: “Do not throw it away, you must take it to a special facility.” recycling point (Fig. 6). And this sign on the battery is worth it for a reason! Each battery contains from 10 to 20 chemical elements, many of which are toxic. These are mercury, nickel, cadmium, lead, which tend to accumulate in living organisms, including the human body, and cause significant harm to health.

We wondered why the substances in the battery are dangerous to humans. And I learned that: lead accumulates mainly in the kidneys. It also causes brain diseases and nervous disorders. Cadmium accumulates in the liver, kidneys, bones and thyroid gland. It is a carcinogen, meaning it causes cancer. Mercury affects the brain, nervous system, kidneys and liver. Causes nervous disorders, blurred vision, hearing, musculoskeletal disorders, and respiratory system diseases. Children are the most vulnerable. Metallic mercury is poison. According to the degree of impact on the human body, mercury belongs to the 1st hazard class - “extremely hazardous substances”. Regardless of the route of entry into the body, mercury accumulates in the kidneys.

We learned from the literature that an improperly disposed battery can contaminate 20 square meters of land, as well as up to 200 liters of water. This can lead to the death of both plants and animals. Getting into general garbage and then into landfills, the integrity of the battery case is compromised due to rusting and corrosion, and dangerous toxic elements enter the soil and groundwater, and from there into seas, lakes and other natural bodies of water.

Experimental study of batteries confirming the presence of harmful substances in them

Experiment 1. The effect of water on the metal shell of the battery

We decided to test experimentally whether the substances it contains are released from the battery.

In the first experiment, we decided to test what would happen to water if we put a battery in water. I took the battery and, with the help of my parents, disassembled it (Fig. 7). I put the disassembled battery in a glass of water. The water immediately turned gray. Then I took the whole battery and put it in a second glass of water. The water did not change its color. And in the third, he left clean water for control. We tightly closed all 3 glasses and left them for observation. A week later, we noticed that the water in the second glass became cloudy (Fig. 8-9).

Rice. 7 Fig. 8 Fig. 9

Conclusion: the metal shell of the battery is destroyed by water, and harmful substances contained in the battery enter the water.

Experiment 2. Effect of contaminated water on plants

In the second experiment, we decided to test the effect of contaminated water on plants. We took three flowers and placed them in experimental glasses with water. Three days later, we saw that the flower petals standing in glasses with contaminated water had withered. But the flower standing in a glass of clean water has not changed and remains in the same state. Therefore, we can conclude that water contaminated with harmful battery substances has a negative effect on plants (Fig. 10-11).

Rice. 10 Fig. eleven

Experiment 3. The influence of an alkaline environment on the battery case

In my environment classes, I learned that soils can be acidic or alkaline. How will the battery behave if it finds itself in such conditions? 2 experiments were carried out in the chemistry classroom of our school.

For the first experiment, we placed a AA battery in a solution of copper sulfate (alkaline medium). The battery placed in the solution began to darken and then rust. In chemical reactions with salts of other metals, copper sulfate tends to exchange ions. This is what happened in our experience; salts of heavy metals were formed. This also happens in natural conditions. The resulting heavy metal salts end up in the soil and groundwater. This happens much faster than in plain water (Fig. 12).

Experiment 4. The effect of an acidic environment on the battery case

In our second experiment, we wanted to see what happens if a battery gets into acidic soil. For this experiment, we place the battery in an acid solution. In this case it is hydrochloric acid. Pre-weigh the battery. When the battery is placed in the solution, gas is released. When this gas is ignited, a pop is made, this is hydrogen released. We take out the battery - the rust has disappeared. We weigh again. The mass of the element has decreased. Thus, this experiment proved that batteries placed in acidic soils will produce more than a harmless pop (Fig. 13-14).

As we learned from theory and confirmed experimentally with improper disposal, i.e. If you and I throw a battery in the trash, toxic substances will end up on our table in one way or another. In the summer, due to the high air temperature in landfills, garbage, and with it various batteries, can smolder. And in waste incineration plants, batteries, along with the rest of the garbage, burn and release huge amounts of dioxins into the air (Fig. 15). They, in turn, enter the human body. Salts of heavy metals and dioxins, when entering the human body, can accumulate in various organs and cause irreversible processes, which leads to various incurable diseases. It is impossible to get rid of them by any boiling, because they are not germs and bacteria.

But what to do? After all, we cannot completely abandon batteries in everyday life. There is only one conclusion: you need to properly dispose of used batteries.

Interview about recycling batteries in the Tuymazinsky district.

We began to wonder where in our city there was a collection point for used batteries. For this purpose, we visited the local Sanitary and Epidemiological Station (Fig. 16). As a result of interviews with employees, we learned that the station does not engage in recycling.

Next we headed to the Tuymazinsky territorial department of the Ministry of Natural Resources and Ecology of the Republic of Bashkortostan. From an interview with environmental engineer Ibragimova Irina Zakiryevna, we learned that garbage from the city of Tuymazy is transported to a landfill located 4 km from Tuymazy at the exit towards the village of Ismailovo. When sorting household waste, paper, metals and PEDs are removed, but batteries and accumulators are not removed from general waste. When asked whether local residents bring “dead” batteries to the institution, we received a negative answer (Fig. 17).

We also addressed this question to Yulia Sergeevna Fedorova, an environmental expert at the ECO Municipal Unitary Enterprise. It turned out that there is no established process for receiving used batteries in the city of Tuymazy, and it is unknown how aware the residents of our city are about this problem (Fig. 18). Questionnaire “Used battery”.

Based on this, I became interested in how competently my classmates and their families approached this issue. For this purpose, we decided to conduct a survey among third-graders of MBOU Secondary School No. 8. 126 students participated in the survey (Fig. 19).

Based on the survey results, we learned that, firstly, all families use different nutritional elements (Fig. 20). Secondly, they are used in various toys, flashlights, remote controls, calculators, computer mice, and so on (Fig. 20). Thus, batteries are still necessary in our daily lives and there is nothing to replace them yet. But the answers to the questions of the third point completely depressed us (Fig. 21).

Unfortunately, the awareness of the average elementary school student leaves little to be desired. Having learned about this problem, we could not ignore it and decided to make our own, albeit small, contribution to solving this problem.

Informing residents of the entrance. Organizing the collection of batteries.

First of all, we decided to post a propaganda notice (Fig. 22) and install a container for collecting used batteries in our entrance. I am very glad that many residents were understanding and actively began to take part in our mini-action (Fig. 23). Once our container is full, my parents and I will take it to nearby collection points in other cities. The nearest battery collection points are located in the city of Ufa. In Ufa, the following collections are currently carried out:

1. Youth department of the Central City Library together with the EKA-Bashkortostan movement;

2. Hypermarkets “Markt Media”;

3. Real estate agency "Sun";

4. Online store “I-Me”.

In class, I spent a class hour dedicated to this problem, and held an explanatory conversation so that under no circumstances would our students or their family members throw batteries in the trash. We suggest sealing AA batteries in small plastic bottles for water, juices, shampoos, etc. He also suggested that his classmates organize “mini-points” for collecting recycled batteries at their place of residence (Fig. 24).

In other countries, battery recycling is already an established process. This is how in Japan they collect, sort and store finger batteries, as well as other types of batteries, until the optimal type of recycling is invented. In European countries, all large supermarkets have containers for collecting used waste (Fig. 25). Since 2013, the only plant in Russia for recycling batteries and accumulators that have outlived their useful life has been operating in the city of Chelyabinsk (Fig. 26). This plant processes batteries and extracts useful resources for recycling. The Megapolisresurs company processes only manganese-zinc batteries, which account for about 80% of total consumption. Batteries containing more mercury, lithium-ion batteries, are now only being accumulated by the enterprise. Our immediate plans include addressing the residents of our city through the media, in particular through the Tuymazinsky Vestnik.

Conclusion

Summing up the results of theoretical and experimental research, we can say that our hypothesis was confirmed. Batteries do contain chemicals that are harmful to the environment and, in particular, to wildlife. Under the influence of the acidic, alkaline environment of the soil, under the influence of water, the integrity of the battery case is damaged, and the harmful elements contained in it enter the soil, groundwater, and, naturally, into the body of humans and animals. All this happens due to improper disposal of batteries. We found that more than 85% of respondents were unaware of the harmful effects of improper battery disposal on the environment and public health, even though every battery is labeled “do not dispose of in the trash.”

They also confirmed that there is a problem with recycling batteries in our city and region, since there are no collection points for used batteries, but people agree to hand over used batteries to stores or collection points. There are still collection points, often organized by volunteers, and various organizations and retail chains are gradually joining in.

In connection with the above, we offer residents of our city:

1. Choose equipment that does not require the use of batteries, i.e. operates manually, from the mains or using light energy.

2. Use rechargeable batteries.

3. Buy batteries marked “cadmium-free” and “mercury-free”.

4. Try not to throw away batteries along with other garbage, use special containers or take them to special collection points. You can collect batteries in plastic bottles or regular plastic bags.

5. Use batteries wisely to extend their service life.

Bibliographic link

Pirmamedov M.I. BATTERY AS A SOURCE OF HAZARD FOR THE ENVIRONMENT // Start in Science. – 2016. – No. 2. – P. 143-152;
URL: http://science-start.ru/ru/article/view?id=53 (access date: 09/02/2019).

You never know what you can do till you try!
Go explorers!

ELECTRIC MOTOR IN 10 SECONDS

Prepare: a screw, a battery, a piece of wire and a magnet.
The magnet for the experiment can be removed from old small headphones
or remove the compact version from the refrigerator magnet.
The screw needs a flat head. We strip a piece of wire (15 cm is enough) from both ends.

1. Bend the wire slightly and place a screw on the magnet (it sticks to the magnet with the flat of the head).
2. We hang a screw with a magnet from the battery.
The screw becomes magnetized and sticks to the battery with its tip.

3. Using the finger of one hand, press one end of the wire to the opposite end of the battery,
We bring the second end closer to the head of the screw with a magnet.

4. As soon as the contact touches the magnet, the screw begins to rotate quickly.
How it works?
A current-carrying conductor in a magnetic field is subject to a force that causes it to rotate.
The rotor here is a screw, we pass current through it, and the magnetic field is provided by a magnet.
It's simple. Considering the low friction force (the screw touches the battery at one point)
The rotor-screw can spin up to 10 thousand revolutions per minute.
The operating device must be held away from eyes
because a screw can easily fly off at high speed and hit you.

How to ensure that the battery lasts as long as possible? How to make fire without matches and a lighter? How to “bury” a battery correctly? It is difficult for a civilized person to imagine life without batteries. But, as experience shows, we are not sufficiently informed about the possibilities of the things that surround our everyday life. 10 life hacks with batteries are proof of this.

1. Mobile hand warmer
People are divided into two types. Some feel comfortable even in the cold. Others freeze in mid-July. If you are familiar with the problem of cold hands firsthand, keep a mini-battery heater on hand, or rather in your hands. Wrap the battery in foil, securing it to the contact poles. Clamp the poles and enjoy the warmth. Before taking mini heaters with you, make sure the batteries are charged.

2. Charged or dead – how to tell?

But how do you know if the battery is charged without devices? Drop the battery onto the table with the negative side from a small height (2-3 cm). The discharged one will bounce loudly and fall. Charged, it will most likely land on the pole with a thud.

3. DIY electromagnet

Using simple items - a battery, insulated copper wire (at least 1.5 meters) and a large nail/bolt, you can make a powerful electromagnet. Wrap the wire around the nail from one end to the other. Each end of the nail should have “tails” for connection to the battery. As soon as you connect the ends of the wire to the battery, the structure will turn into an electromagnet. Look for or pick up any metal objects for them. After disconnecting the elements, the electromagnet loses strength.

4. Fire from a battery: “prison lighter”

One of the favorite tricks of life hackers (and others) is making fire using a battery. You will need a strip of foil with a paper base (for example, from chewing gum) 6-7 mm wide at the ends, tapered to 2 mm in the center. Attach the ends of the strip to the poles of the battery and bring the device to the paper, which will immediately ignite.

5. AAA instead of AA

Need AA, but only AAA is available? The problem can be solved simply - with a piece of foil, which will hold the battery in the connector and bring the device into working condition.

6. Opening the Krona battery

Krona alkaline batteries contain 6 AAAA batteries with a voltage of 1.5 V, which can easily be converted into AAA batteries using the above life hack.

7. Why crush dead batteries?

A kopeck saves the ruble. Do not throw away dead batteries. If you crush a discharged battery, for example, with your teeth or pliers, it will gain momentum for a second life. By the way, a heavily dented battery can leak and ruin the device.

8. Stylus for smartphone

By the way, the negative side of a AA battery can be a stylus for a capacitive touch screen.

9. A gift to future generations

A battery thrown into the trash will cause serious damage to the environment. Once outside, it will pollute 20 square meters of land or 400 liters of water with harmful components. Place used batteries in a plastic bottle, and while it is filling, find the nearest collection point for batteries, of which, unfortunately, there are few in Russia.

10. Responsibility to nature with Ikea

The Ikea store chain has resumed accepting used batteries and mercury-containing lamps. The store does not charge any fees for the collection and subsequent disposal of batteries. Look for special containers at the exit of the store!

How to get the most out of a battery? How to make fire without matches and a lighter? How to “bury” a battery correctly? It is difficult for a civilized person to imagine life without batteries. But, as experience shows, we are not sufficiently informed about the possibilities of the things that surround our everyday life. 10 life hacks with batteries are proof of this.

1. Mobile hand warmer

• People are divided into two types. Some feel comfortable even in the cold. Others freeze in mid-July. If you are familiar with the problem of cold hands firsthand, keep a mini-battery heater on hand, or rather in your hands. Wrap the battery in foil, securing it to the contact poles. Clamp the poles and enjoy the warmth. Before taking mini heaters with you, make sure the batteries are charged.

2. Charged or dead – how to tell?

• But how do you know if the battery is charged without devices? Drop the battery onto the table with the negative side from a small height (2-3 cm). The discharged one will bounce loudly and fall. Charged, it will most likely land on the pole with a thud.

3. DIY electromagnet

• Using simple items - a battery, insulated copper wire (at least 1.5 meters) and a large nail/bolt, you can make a powerful electromagnet. Wrap the wire around the nail from one end to the other. Each end of the nail should have “tails” for connection to the battery. As soon as you connect the ends of the wire to the battery, the structure will turn into an electromagnet. Look for or pick up any metal objects for them. After disconnecting the elements, the electromagnet loses strength.

4. Fire from a battery: “prison lighter”

• One of the favorite tricks of life hackers (and others) is making fire using a battery. You will need a strip of foil with a paper base (for example, from chewing gum) 6-7 mm wide at the ends, tapered to 2 mm in the center. Attach the ends of the strip to the poles of the battery and bring the device to the paper, which will immediately ignite.

5. AAA instead of AA

• Need AA, but only AAA is available? The problem can be solved simply - with a piece of foil, which will hold the battery in the connector and bring the device into working condition.

6. Opening the Krona battery

• Krona alkaline batteries contain 6 AAAA batteries with a voltage of 1.5 V, which can easily be converted into AAA batteries using the above life hack.

7. Why crush dead batteries?

• A kopeck saves the ruble. Do not throw away dead batteries. If you crush a discharged battery, for example, with your teeth or pliers, it will gain momentum for a second life. By the way, a heavily dented battery can leak and ruin the device.

8. Stylus for smartphone

• By the way, the negative side of a AA battery can be a stylus for a capacitive touch screen.

9. A gift to future generations

• A battery thrown into the trash will cause serious damage to the environment. Once outside, it will pollute 20 square meters of land or 400 liters of water with harmful components. Place used batteries in a plastic bottle, and while it is filling, find the nearest collection point for batteries, of which, unfortunately, there are few in Russia.

10. Responsibility to nature with Ikea

The Ikea store chain has resumed accepting used batteries and mercury-containing lamps. The store does not charge any fees for the collection and subsequent disposal of batteries. Look for special containers at the exit of the store!