Advantages:
For humans, water is the most important substance after oxygen.
In the adult body, 60 to 70% of its mass is made up of water. The proportion of water in children's bodies is even higher, reaching almost 80%.
If a person does not eat and relies only on nutrients stored in their body or consumes their own tissues, they can live for a month. But it is difficult to go even a week without drinking water. Loss of 10% of water in the body threatens health, and loss of 20% of water endangers life. This shows the importance of water for life.
Water also has the effect of treating common illnesses. For example: a cup of cold boiled water in the morning can treat pimples; drinking water half an hour after a meal can be used to lose weight; the massage effect of hot water is a powerful soothing effect. Taking medication can helpr insomnia; drinking large sips of water can relieve constipation; a glass of water before going to bed is good for the heart, when you feel sick you can use salt water; to induce vomiting.
Dangers:
In nature, due to different climatic conditions, water will also appear as hail, fog, dew, frost, etc. and will affect the climate and human activities. .
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< p>Detailed information:
Water (chemical formula: H?O) is an inorganic substance composed of hydrogen and oxygen and is non-toxic. It is a colorless and odorless transparent liquid at normal temperature and pressure, known as the source of human life. Water includes natural water (rivers, lakes, atmospheric water, sea water, groundwater, etc.) {containing impurities}, distilled water is pure water, and artificial water (water obtained by combining hydrogen and oxygen atoms through chemical reactions).
Water is one of the most common substances on Earth and is essential for all life, including inorganics and humans. An important resource for survival and the most important component of living organisms. Water has played an important role in the evolution of life. It is a non-renewable resource in the narrow sense and a renewable resource in the broad sense.
Pure water can conduct electricity, but very weakly (conductivity can beignored in daily life), and it is an extremely weak electrolyte. Water in daily life contains more positive and negative ions due to other dissolved electrolytes, and its conductivity is improved.
References:
Advantages:
For humans, water is the most important substance after oxygen.
In adults, 60-70% of the body mass is water. The proportion of water in the body of children is even greater, reaching almost 80%. p>
If a person does not eat, he only depends on the water nutrients stored in his body. You can live for a month if you consume your own tissues, but if you do not drink water, it. serIt's hard to survive even a week. Losing 10% of body water will threaten your health. If you lose 20% of the water, you will put your life in danger. This shows the impact of water on life.
Water also has the effect of treating common illnesses. cold boiled water in the morning can treat pimples; drinking water half an hour after a meal can be used to lose weight; the massage effect of hot water is an effective tranquilizer that can relieve insomnia; a glass of water before bed is good for the heart; when you are sick, you can use salt water to induce vomiting:
In nature, due to different factors. climatic conditions, water will also appear as hail, fog, dew, frost, etc. and will affect the climate and human activities
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Water (fochemical formula: H?O) is composed of hydrogen and oxygen. It is an inorganic compound. substance composed of elements and non-toxic. It is a colorless and odorless transparent liquid at normal temperature and pressure. It is called the source of human life. It includes natural water (rivers, lakes, atmospheric water, sea water, groundwater). , etc.) {including impurities}, distilled water is pure water, artificial water (water obtained by combining hydrogen and oxygen atoms through chemical reactions
< p>Water is one of the most common substances on earth, including inorganic compounds and human beings. An important resource for the survival of all life in the world, water plays an important role in evolution. of life. It is a non-renewable resource in the narrow sense and a renewable resource in the broad sense.Pure water. It can conduct electricity, but very weakly (conductivity can be ignored in. the vie daily), and it is an extremely weak electrolyte. Water in daily life contains more positive and negative ions due to other dissolved electrolytes, and its conductivity is improved.
Reference:
Bad things: Flooding of fields and crops.
The importance of water:
1. On earth, wherever there is water, there is life. All vital activities come from water.
2. Water in the human body makes up about 65% of body weight. Among them, the brain contains 75% water, blood contains 83% water, muscles contain 76% water, and even hard bones contain 22% water!
3. Without water, nutrients in food cannot be absorbed, waste cannot be excreted, and medications cannot be absorbed.reach the action site.
4. Once the human body lacks water, the consequences will be very serious. 1-2% dehydration will make you thirsty; 5% dehydration will cause dry mouth, skin wrinkles, confusion and even visual hallucinations; 15% dehydration is often worse than hunger.
5. People can live a long time without food (some estimates are two months). If there is no water, they can live for about a week at most.
Properties of water:
1. Water is a colorless and odorless transparent liquid at normal temperature and pressure. In nature, pure water is rare. Water is usually a solution of acids, alkalis, salts and other substances. This aqueous solution is still called water.
2. Pure water can be obtained by several distillations using platinum or quartz vessels. Of course, this is pure water in a real sense.ative and cannot be absolutely free of impurities.
3. Water is a substance that can be transformed between liquid, gas and solid states. Solid water is called ice; carbonated water is called water vapor. When the water vapor temperature is higher than 374.2°C, gaseous water cannot be transformed into liquid water by pressurization.