Water is a substance that is in a liquid state, it is colorless, transparent, odorless, it can change shape (for example: if you tilt a test tube, the water will change shape), it enlarges objects (example: my fingers, with which I hold a test tube, appear larger when viewed through a test tube of water) and can dissolve various substances.
The property of water transparency can be proven by placing different pictures or even a page with text behind a test tube with water - you can see what is behind the test tube. This experiment proves that glass is also transparent. It can be proven another way. Put the picture in a plate and pour water into it. You can also see what is in the plate, filled with water. This experience also proves the property of water - transparency. The property of water transparency is used very widely by humans: aquariums with strange fish and algae, pools and fountains with a beautiful design of the bottom and walls, and more.
Water has no smell. You can smell it and see for yourself. A person uses this property of water, for example, when saving from pursuing predatory animals: once you enter the water, the trace of the person will be lost, the animal will not be able to determine the direction of movement of the person who entered the water.
Water takes the shape of the container into which it is poured (for example: pour water from a glass into laboratory flasks of different shapes). This property of water is also widely used by humans. For example: by pouring water into a container, you can thereby emphasize the originality of this container, its design and beauty.
The water is flowing. For example: if you pour it onto a flat tray, it spreads into a puddle. This property of water is widely used by humans in housing and communal services: water, flowing through pipes, enters our houses and apartments.
Objects in water appear larger than they actually are. This can be seen by looking at how the part of the picture that is visible through the water has enlarged. Or maybe this glass magnifies? No, because the fish in the aquarium also seem larger if you look only through the water.
Water can dissolve different substances. If you pour crushed chalk into a test tube, the water will become cloudy because some of the chalk has dissolved in the water.
Water is an excellent solvent and therefore it is impossible to find liquid “pure” water in nature, that is, water in which no substances are dissolved. Water is an excellent habitat for living organisms and therefore it is impossible to find “clean” water in nature, i.e. water in which there would be no
inhabited by microbes, bacteria, mollusks, fish, etc.
Water does not dissolve all substances. If you pour Vaseline oil into a test tube with water, it will not mix with the water, but will float on top of the water.
Water can be purified using a filter. If you put a paper napkin or cotton wool into a funnel and pass water in which chalk is dissolved through it, you will see that the water has become cleaner. If you do this a few more times, the water will become completely clear.
It is well known that life on planet Earth arose due to the presence of water. Life arose in water, came out of it, gradually populating land and air. Water forms the water shell of our planet - the hydrosphere (from the Greek words “gidor” - water, “sphere” - ball). Water occupies three quarters of the Earth’s surface. In nature, the bowls of the oceans, seas, lakes, rivers, and swamps are filled with it. There are also artificial reservoirs for storing and transferring water - ponds, reservoirs and canals. There is also water in the depths of the Earth and in its atmosphere.
All plants and animals need water to survive. Our bodies are approximately 75% water. Without water, our body simply cannot function.
Without water, life on planet Earth is unthinkable, human life is unthinkable. Water is the most common, accessible and cheap substance. It is the availability and irreplaceability of water that has led to its widespread use in everyday life, industry and agriculture, medicine - in all spheres of human activity. It's hard to remember where water isn't used.
Water is the largest and most convenient road. Ships sail along it day and night, carrying various cargoes and passengers. Water also feeds us - thousands of fishing vessels sail across the seas and oceans.
In thermal power engineering, water is a coolant and a working fluid. Water “extracts ” electric current while working in power plants. Thermal power plants use a lot of water to produce electricity. In particular, for cooling the turbine condenser of the power unit. A constant uncontrolled increase in electricity production only at thermal power plants can lead to an environmental disaster.
In metallurgy, water is used to cool equipment. Just cooling one blast furnace uses a huge amount of water every hour.
In chemistry, water is a solvent; one of the components of some chemical reactions; “vehicle”, that is, a medium that allows the constituent reaction products to be moved from one technological apparatus to another. Ultimately, liquid production waste is also released into the environment in the form of aqueous solutions.
In medicine, water is a solvent, a medicine, a means of sanitation and hygiene, and a “vehicle”. Increasing levels of medical care and population growth on planet Earth naturally lead to an increase in water consumption for medical purposes.
In agriculture, water is a “vehicle” of nutrients to the cells of plants and animals, a participant in the process of photosynthesis, and a temperature regulator of living organisms. The volumes of water used for watering agricultural plants and feeding animals and poultry are not inferior to the volumes used by industry.
In everyday life, water is a means of sanitation and hygiene, a participant in chemical reactions that occur during cooking, a coolant, a “vehicle” that removes human waste products into the sewer system. Water washes all people, cars, roads. The rate of water consumption per person varies significantly among individual cities. Let's think about the approximately 6 billion people inhabiting planet Earth and it becomes clear to us why from time to time there is talk of ever-increasing problems with drinking water, even in regions of the planet where there is a lot of water.
Without water you cannot knead dough for bread, you cannot prepare concrete for construction, you cannot make paper, fabric for clothing, rubber, metal, candy, plastic, or medicine - nothing can be done without water!
Water is the only substance on Earth that exists in different states at once: water can be liquid, when cooled it turns into a solid state - ice, and when heated it turns from liquid into vapor.
Let's track the “feedback” between the water consumed by humans and the set of dissolved substances, solid inclusions and microorganisms that are discharged in the form of household wastewater, liquid waste from industrial and agricultural production. For example, about 200 years ago, only organoleptic methods were used to assess the quality of drinking water: assessment of color, taste, smell. Nowadays, the list of tests performed by the sanitary laboratory of a food industry enterprise is placed on two pages filled with small print. What methods of water treatment and purification exist so that a person can use water for the necessary purposes?
Let's start with the concept: what is water treatment and water purification? Let's turn to reference literature. The Encyclopedic Dictionary of Medical Terms reports: “Water purification is a set of sanitary and technical measures aimed at removing impurities that pose a danger to humans.” Agricultural dictionary: "Water purification - bringing the quality of source water in accordance with consumer requirements. Methods of water purification: clarification (elimination of turbidity), discoloration (elimination of organic substances), disinfection, deodorization, desalination, softening." Great Soviet Encyclopedia: "Water Treatment - treatment of water coming from a natural water source to feed steam and hot water boilers or for various technological purposes. Water treatment is carried out at thermal power plants, transport, public utilities, and industrial enterprises.
Summarize:
It was agreed upon to refer to water treatment as bringing the quality of water to
compliance with the requirements of industrial enterprises;
Purification of water used for human and animal needs is called
bringing water quality to the standards determined by the relevant
GOST (state standards);
Treatment of wastewater discharged from industrial and municipal
enterprises, let's call bringing the composition of liquid waste to
compliance with MPC standards (maximum permissible concentrations).
As noted above, due to the growth of knowledge and the deterioration of the environmental situation as a consequence of human activity, standards for consumed water are constantly being revised. To meet them, water purification technologies and equipment are being improved. The task of man is to use water and its properties for his own benefit without creating problems in the aquatic ecosystem that can lead to disaster - pollution and reduction in the volume of fresh water and the waters of the seas and oceans.
Water is one of the main resources on Earth. It is difficult to imagine what would happen to our planet if fresh water disappeared. A person needs to drink about 1.7 liters of water per day. And each of us needs about 20 times more daily for washing, cooking, and so on. The threat of fresh water disappearance exists. All living things suffer from water pollution; it is harmful to human health.
Therefore, water - our main wealth - must be protected!!!
Water is a substance that is in a liquid state, it is colorless, transparent, odorless, it can change shape (for example: if you tilt a test tube, the water will change shape), it enlarges objects (for example: my fingers, with which I hold a test tube, appear larger when viewed through a test tube of water) and can dissolve various substances.
The property of water transparency can be proven by placing different pictures or even a page with text behind a test tube with water - you can see what is behind the test tube. This experiment proves that glass is also transparent. It can be proven another way. Put the picture in a plate and pour water into it. You can also see what is in the plate, filled with water. This experience also proves the property of water - transparency. The property of water transparency is used very widely by humans: aquariums with strange fish and algae, pools and fountains with a beautiful design of the bottom and walls, and more.
Water has no smell. You can smell it and see for yourself. A person uses this property of water, for example, when saving from pursuing predatory animals: as soon as one enters the water, the trace of the person will be lost, the animal will not be able to determine the direction of movement of the person who entered the water.
Water takes the shape of the container into which it is poured (for example: pour water from a glass into laboratory flasks of different shapes). This property of water is also widely used by humans. For example: by pouring water into a container, you can thereby emphasize the originality of this container, its design and beauty.
The water is flowing. For example: if you pour it onto a flat tray, it spreads into a puddle. This property of water is widely used by humans in housing and communal services: water, flowing through pipes, enters our houses and apartments.
Objects in water appear larger than they actually are. This can be seen by looking at how the part of the picture that is visible through the water has enlarged. Or maybe this glass magnifies? No, because the fish in the aquarium also seem larger if you look only through the water.
Water can dissolve different substances. If you pour crushed chalk into a test tube, the water will become cloudy because some of the chalk has dissolved in the water.
Water is an excellent solvent and therefore it is impossible to find liquid “pure” water in nature, that is, water in which no substances are dissolved. Water is an excellent habitat for living organisms and therefore it is impossible to find “clean” water in nature, i.e. water in which there would be no
inhabited by microbes, bacteria, mollusks, fish, etc.
Water does not dissolve all substances. If you pour Vaseline oil into a test tube with water, it will not mix with the water, but will float on top of the water.
Water can be purified using a filter. If you put a paper napkin or cotton wool into a funnel and pass water in which chalk is dissolved through it, you will see that the water has become cleaner. If you do this a few more times, the water will become completely clear.
It is well known that life on planet Earth arose due to the presence of water. Life arose in water, came out of it, gradually populating land and air. Water forms the water shell of our planet - the hydrosphere (from the Greek words “gidor” - water, “sphere” - ball). Water occupies three quarters of the Earth's surface. In nature, the bowls of the oceans, seas, lakes, rivers, and swamps are filled with it. There are also artificial reservoirs for storing and transferring water - ponds, reservoirs and canals. There is also water in the depths of the Earth and in its atmosphere.
All plants and animals need water to survive. Our bodies are approximately 75% water. Without water, our body simply cannot function.
Without water, life on planet Earth is unthinkable, human life is unthinkable. Water is the most common, accessible and cheap substance. It is the availability and irreplaceability of water that has led to its widespread use in everyday life, industry and agriculture, medicine - in all spheres of human activity. It's hard to remember where water isn't used.
Water is the largest and most convenient road. Ships sail along it day and night, carrying various cargoes and passengers. Water also feeds us - thousands of fishing vessels sail across the seas and oceans.
In thermal power engineering, water is a coolant and a working fluid. Water “produces” electric current by working in power plants. Thermal power plants use a lot of water to produce electricity. In particular, for cooling the turbine condenser of the power unit. A constant uncontrolled increase in electricity production only at thermal power plants can lead to an environmental disaster.
In metallurgy, water is used to cool equipment. Just cooling one blast furnace uses a huge amount of water every hour.
In chemistry, water is a solvent; one of the components of some chemical reactions; “vehicle”, that is, a medium that allows the constituent reaction products to be moved from one technological apparatus to another. Ultimately, liquid production waste is also released into the environment in the form of aqueous solutions.
In medicine, water is a solvent, a medicine, a means of sanitation and hygiene, and a “vehicle”. Increasing levels of medical care and population growth on planet Earth naturally lead to an increase in water consumption for medical purposes.
In agriculture, water is a “vehicle” of nutrients to the cells of plants and animals, a participant in the process of photosynthesis, and a temperature regulator of living organisms. The volumes of water used for watering agricultural plants and feeding animals and poultry are not inferior to the volumes used by industry.
In everyday life, water is a means of sanitation and hygiene, a participant in chemical reactions that occur during cooking, a coolant, a “vehicle” that removes human waste products into the sewer system. Water washes all people, cars, roads. The rate of water consumption per person varies significantly among individual cities. Let's think about the approximately 6 billion people inhabiting planet Earth and it becomes clear to us why from time to time there is talk of ever-increasing problems with drinking water, even in regions of the planet where there is a lot of water.
Without water you cannot knead dough for bread, you cannot prepare concrete for construction, you cannot make paper, fabric for clothing, rubber, metal, candy, plastic, or medicine - nothing can be done without water!
Water is the only substance on Earth that exists in different states at once: water can be liquid, when cooled it turns into a solid state - ice, and when heated it turns from liquid into vapor.
Let's track the “feedback” between the water consumed by humans and the set of dissolved substances, solid inclusions and microorganisms that are discharged in the form of household wastewater, liquid waste from industrial and agricultural production. For example, about 200 years ago, only organoleptic methods were used to assess the quality of drinking water: assessment of color, taste, smell. Nowadays, the list of tests performed by the sanitary laboratory of a food industry enterprise is placed on two pages filled with small print. What methods of water treatment and purification exist so that a person can use water for the necessary purposes?
Let's start with the concept: what is water treatment and water purification? Let's turn to reference literature. The Encyclopedic Dictionary of Medical Terms reports: “Water purification is a set of sanitary and technical measures aimed at removing impurities that pose a danger to humans.” Agricultural dictionary: "Water purification - bringing the quality of source water in accordance with consumer requirements. Methods of water purification: clarification (elimination of turbidity), discoloration (elimination of organic substances), disinfection, deodorization, desalination, softening." Great Soviet Encyclopedia: "Water Treatment - treatment of water coming from a natural water source to feed steam and hot water boilers or for various technological purposes. Water treatment is carried out at thermal power plants, transport, public utilities, and industrial enterprises.
Summarize:
It was agreed upon to refer to water treatment as bringing the quality of water to
compliance with the requirements of industrial enterprises;
Purification of water used for human and animal needs is called
bringing water quality to the standards determined by the relevant
GOST (state standards);
Treatment of wastewater discharged from industrial and municipal
enterprises, let's call bringing the composition of liquid waste to
compliance with MPC standards (maximum permissible concentrations).
As noted above, due to the growth of knowledge and the deterioration of the environmental situation as a consequence of human activity, standards for consumed water are constantly being revised. To meet them, water purification technologies and equipment are being improved. The task of man is to use water and its properties for his own benefit without creating problems in the aquatic ecosystem that can lead to disaster - pollution and reduction in the volume of fresh water and the waters of the seas and oceans.
Water is one of the main resources on Earth. It is difficult to imagine what would happen to our planet if fresh water disappeared. A person needs to drink about 1.7 liters of water per day. And each of us needs about 20 times more daily for washing, cooking, and so on. The threat of fresh water disappearance exists. All living things suffer from water pollution; it is harmful to human health.
Sections on this page:
There is no absolutely pure water in nature; it always contains some impurities. Some of them are desirable because they are needed by the human body. Others may be hazardous to health and make the water unusable.
Water is a solvent
There are no substances that, at least to a small extent, do not dissolve in water. Even gold, silver, iron, and glass dissolve to a small extent in water. Scientists have calculated that, for example, when we drink a glass of hot tea, we absorb approximately 0.0001 g of dissolved glass along with it. Because of water's ability to dissolve other substances, it can never be called absolutely pure. The concept of “clean” water is relative.
A liquid containing foreign substances that are evenly distributed in it is called a solution. Solutions are always transparent.
Natural water may contain various particles that are not dissolved in it. Such particles make it cloudy. In this case, they talk about suspension. After standing for some time, the cloudy liquid becomes transparent. Undissolved particles of matter sink to the bottom. And in solutions, no matter how long they stand, substances do not settle to the bottom.
Filtering through the soil, natural and waste waters are to some extent purified from undissolved suspended particles.
People have long noticed that water poured into silver vessels does not spoil for a long time. The fact is that it contains dissolved silver, which has a detrimental effect on bacteria in the water. “Silver” water is used, in particular, by astronauts during flights.
Not only solid and liquid substances dissolve in water, but also gases, such as oxygen, nitrogen, carbon dioxide, etc. Fish, as well as other animals and plants, breathe oxygen dissolved in water.
The production of carbonated water is based on the dissolution of carbon dioxide in water.
Work of water in nature
Many phenomena on the Earth's surface occur with the participation of water. Thus, streams of melt water, when united, become formidable streams and can cause great destruction. They wash away and take with them the top layers of fertile soil. Seeping into the ground, water erodes and dissolves various rocks. This is how voids – caves – are formed underground.
Terrible natural disasters are well known - floods, during which water demolishes bridges and crossings, destroys banks and buildings, destroys crops, and takes human lives.
Rice. 55. Spring flood
But water does more than just destructive work. River water during the spring flood (Fig. 55) deposits fertile silt on individual areas of the land (Fig. 56). Vegetation develops very well on them.
Rice. 56. Work of water in nature
Not a single process in living organisms takes place without the participation of water. Plants need it to absorb substances from the soil, move them throughout the plant in the form of solutions, and for seed germination.
Water is a habitat for many living organisms that cannot be found on land (Fig. 57).
Rice. 57. Starfish
The role of water in the life of human society is exceptional. Man has turned reservoirs into transport routes, and river flows into a source of cheap electricity. Water resources are the national wealth of our country, which requires careful treatment: strict accounting, protection from pollution (Fig. 58), and economical use.
Rice. 58. Pollution of the sea beach with household waste
In the process of economic activity, people use a huge amount of clean water. Every year, industrial waste pollutes 12% of the world's river flows. Fish and other aquatic life die in water bodies poisoned by industrial and household wastewater. Polluted waters become a source of serious diseases.
1. The bulk of living organisms on land breathe oxygen. Aquatic animals also breathe oxygen. Where does oxygen come from in water?
2. How to distinguish a solution from a suspension?
Many people know that thanks to water, life arose on planet Earth. It is this substance that scientists are looking for on Mars to prove that fauna and flora are present here too. Man today cannot imagine existence without water. All thanks to the miraculous properties of this material.
Water in nature
Water is an odorless and tasteless liquid. This one has practically no color either. In deep layers, the water may have a bluish tint. It is one of the most abundant substances in nature, without which no creature can do. Surprisingly, the hydrosphere occupies more than 70% of the entire biosphere.
Water is a mineral with the help of which industry is organized today, houses are built, and power plants exist. Scientists have found that water is an excellent solvent. Therefore, it is impossible to find ideally in nature. More often there is a liquid with various impurities of organic and inorganic materials. There are a huge number of varieties of water. All of them have found their application in human life. How people use the properties of water will be described below.
Properties of water
A natural mineral can exist in three forms - solid, liquid and vapor. The most common is liquid. The properties of water directly depend on its condition. When a substance freezes, it loses its density and rises to the surface. Thanks to this, the water under the ice always maintains its temperature. Even if the air temperature drops below 40 degrees Celsius, underwater living organisms will continue to exist.
When considering the properties and states of water, one cannot help but remember surface tension. This figure is significantly higher than that of any other liquid. This is what causes raindrops to form. Surface tension is one of the main indicators that influence the water cycle in nature. We can observe the properties of water with our own eyes. Experiments can be carried out at home. It's very interesting and exciting. All you need to do is fill the glass with water to the brim and throw coins or other small objects into it one by one. You may notice that the water does not pour out immediately over the edges of the container, but forms a small slide. This occurs due to the force of surface tension.
Boiling temperature
All liquids that exist in nature have their own boiling point. Water is no exception. This material has a boiling point. These thermophysical properties of water are of great importance in the existence of all living things. The liquid can boil at about 100 degrees Celsius. This indicator may vary slightly depending on what impurities are added to the water. It is the boiling point that directly affects the evaporation processes. The higher this indicator, the less water loss in nature.
The thermophysical properties of water are also widely used in everyday life. During boiling in water, various pathogenic microorganisms die. Thanks to this process, it is possible to purify the liquid from various impurities. can be eaten freely. This liquid is also used to treat medical instruments and wounds.
Water in thermal power engineering
People have been looking for natural sources of energy for many centuries. Such a source can be ordinary water. It is no coincidence that this substance is widely used in thermal power engineering today. This material plays two roles at once - a coolant and a working fluid. In order to produce one megawatt of electricity, it is necessary to use about 30 cubic meters of water per second. The liquid is also used to cool the condenser turbine of the power unit. It turns out that without water it would be impossible to establish access to electricity, and many buildings simply would not be heated.
In the second half of the 20th century, 50% of electricity was generated by hydroelectric power plants. This allowed people to organize their lives normally, and the environmental situation remained at the same level. Man's use of water is inexhaustible if he does everything right. The presence of a large number of cars, exhausts from various plants and factories lead to a decrease in the amount of clean water. Today, much less electricity is generated from water.
Chemistry and water
If we consider it, the first thing that comes to mind is the ability of a liquid to dissolve other substances. Water is the main reagent in many chemical reactions. This property is widely used in everyday life, as well as in production. Water is a special vehicle that allows you to move chemical reaction products from one technological apparatus to another. Liquid waste also enters the environment in the form of suspensions and solutions. The chemical industry simply could not exist without water.
At home, you can also easily monitor the properties of water as a solvent. It is worth noting that the ability to dissolve individual substances depends on the temperature of the water. Many people have noticed that greasy dishes can be easily washed in warm water. But low temperatures do not provide such an opportunity. In everyday life, you can also notice how well-known products such as salt, sugar and soda dissolve in water. Tea is an aqueous solution that is not only healthy, but also tasty.
Water in medicine
Human use of water for medicinal purposes is very common. Here, water most often also acts as a solvent. It can also be used as a medicine and an auxiliary substance for hygiene and sanitation. In recent years, the level of medical care has increased significantly. The world's population is also increasing every year. This leads to an increased need for water consumption for medical purposes.
The properties of liquid water are used to treat many ailments. Of course, the substance is not used in its pure form. Various medicines, solutions and suspensions are made using water. And the boiling point of the liquid is used to process medical instruments and molds.
Many medications only work effectively if you drink enough fluid. You can always read about this in the instructions for use of the medicine. Water plays the role of a vehicle, allowing the medicine to quickly reach the desired organ.
Water in agriculture
It is impossible to imagine agriculture without liquid. How do people use the properties of water in this area? The substance helps deliver beneficial trace elements and minerals to animal and plant cells. Water is an obligatory participant in various metabolic reactions, as well as in the process of photosynthesis. In addition, the temperature of animals and plants is regulated with the help of liquid. Few people know that the volumes of water used for watering plants and keeping livestock are not inferior to industrial volumes.
In order to grow vegetables and fruits efficiently, it is necessary to properly organize watering. In many cases, it is impossible to do without specialists. Only a professional can organize the work in such a way that water is delivered to every plant on the site. Relying only on rain means ruining the land.
How people use the properties of water in cosmetology
Not a single cosmetic product can be made without water. But in this area, a special one is most often used, which has the properties of rejuvenation and skin restoration. The liquid from thermal springs contains trace elements and minerals that can restore the health of skin and hair of any type.
Pure water is also used in cosmetology as a solvent. Using the liquid, various creams, masks and shampoos are prepared. Cosmetics are often prepared at home as well. Before preparing products, it is necessary to briefly study the properties of water. It is necessary to strictly follow the recipe so that the cosmetics turn out to be truly high-quality and useful.
Water in everyday life
How do people use the properties of water at home? Here the liquid most often acts as a food product, as well as a means of hygiene and sanitation. Water can also act as a participant in various chemical reactions that occur during cooking. Thermal energy sources are widely used. For example, boiled water is most often used in nutrition.
The heating supply of apartment buildings is also organized using water. The liquid, when heated to the required temperature, can maintain heat in homes for a long time.
Even in elementary school, kids begin to study the properties of water. 2nd grade is the time when children begin to get acquainted with one of the important substances in nature. The teacher’s task is to teach the child to save water resources in order to prolong life on the planet.
Water has no smell. You can smell it and see for yourself. A person uses this property of water, for example, when saving from pursuing predatory animals: as soon as one enters the water, the trace of the person will be lost, the animal will not be able to determine the direction of movement of the person who entered the water.
Water takes the shape of the container into which it is poured (for example: pour water from a glass into laboratory flasks of different shapes). This property of water is also widely used by humans. For example: by pouring water into a container, you can thereby emphasize the originality of this container, its design and beauty.
The property of water transparency can be proven by placing different pictures or even a page with text behind a test tube with water - you can see what is behind the test tube. This experiment proves that glass is also transparent.
The water is flowing. For example: if you pour it onto a flat tray, it spreads into a puddle. This property of water is widely used by humans in housing and communal services: water, flowing through pipes, enters our houses and apartments.
Objects in water appear larger than they actually are. This can be seen by looking at how the part of the picture that is visible through the water has enlarged. Or maybe this glass magnifies? No, because the fish in the aquarium also seem larger if you look only through the water.
Water can dissolve different substances. If you pour crushed chalk into a test tube, the water will become cloudy because some of the chalk has dissolved in the water.
Water is an excellent solvent and therefore it is impossible to find liquid “pure” water in nature, that is, water in which no substances are dissolved. Water is an excellent habitat for living organisms, and therefore it is impossible to find “clean” water in nature, that is, water in which there is no
inhabited by microbes, bacteria, shellfish, fish, etc.
Water does not dissolve all substances. If you pour Vaseline oil into a test tube with water, it will not mix with the water, but will float on top of the water.
Water can be purified using a filter. If you put a paper napkin or cotton wool into a funnel and pass water in which chalk is dissolved through it, you will see that the water has become cleaner. If you do this a few more times, the water will become completely clear.
In everyday life, water is a means of sanitation and hygiene, a participant in chemical reactions that occur during cooking, a coolant, a “vehicle” that removes human waste products into the sewer system. Water washes all people, cars, roads. The rate of water consumption per person varies significantly among individual cities. Let's think about the approximately 6 billion people inhabiting planet Earth and it becomes clear to us why from time to time there is talk of ever-increasing problems with drinking water, even in regions of the planet where there is a lot of water.
Without water you cannot knead dough for bread, you cannot prepare concrete for construction, you cannot make paper, fabric for clothing, rubber, metal, candy, plastic, or medicine - nothing can be done without water!
Water is the only substance on Earth that exists in different states at once: water can be liquid, when cooled it turns into a solid state - ice, and when heated it turns from liquid into vapor.