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The chemical composition of water, if viewed by mass percentage, contains hydrogen and oxygen. If you look at it by volume, there are two parts hydrogen and one part oxygen. The water molecules that exist alone are called single water molecules, and the association of water molecules can form double water molecules, triwater molecules, etc.
The characteristics of water include high boiling point, high heat of evaporation, high heat capacity, abnormal expansion, good solvent, and continuous association.
Water, like other substances, increases in volume and decreases in density when heated. Pure water has a density of kilogram cubic meters at zero degrees Celsius and kilogram cubic meters at boiling point, with a density reduction of 4%.
At normal atmospheric pressure, when water freezes, the volume suddenly increases by about 11%. When the ice melts, it suddenly decreases in size. According to scientists' observations, in an enclosed space, when water freezes, it turns into ice, and the pressure generated by the increase in volume can reach 2,500 atmospheres.
This property is of great importance to nature and industry. This is why rock fissures gradually increase as they thaw repeatedly. The buried water conveyance plastic pipe is anti-freeze damage, and generally requires a certain buried depth (greater than the depth of the permafrost layer).
The freezing temperature of the water decreases as the pressure increases. For every 130 atmospheres of pressure increase, the freezing temperature of water decreases by 1 degree Celsius. This property of water makes it possible for the deep waters of the ocean not to freeze.
The boiling point of water varies in a linear relationship with the pressure. The boiling point increases with increasing pressure.
The heat capacity of water is higher than that of other substances, except that it is smaller than that of hydrogen and aluminum. Water has less heat transfer than other liquids. Due to this property, the ice body thickens slowly when the natural water body is frozen, and even when the water surface is frozen for a long time, the depth of the river may still be liquid, and this property of water is important for underwater life.
This property of water is also meaningful for guiding irrigation, for example, winter irrigation can increase ground temperature and prevent overwintering crops from low temperature frost damage.
Resources.
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Colorless and odorless. It has fluidity and is liquid.
Let's be clear.
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The chemical formula H2O, a colorless and odorless liquid, essential for life, exists in living organisms in two total forms, free water and bound water. It's good for you to make it clear whether it's physical, chemical or biological.
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Pure water: colorless and odorless, with the smallest density at 4 degrees Celsius, at ordinary air pressure, 0 degrees Celsius freezing point, 100 degrees Celsius boiling point.
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Clear, casual, lively, refreshing.
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It is available in the 5th grade science book.
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Hello dear, wait a minute.
The five characteristics of water are as follows: 1. Water is an inorganic substance composed of hydrogen and oxygen, which is non-toxic and colorless and odorless transparent liquid at room temperature and pressure. 2. Pure water can conduct electricity and is a very weak electrolyte.
3. There are three forms: liquid, solid and gaseous. 4. When the air pressure is a standard atmospheric pressure, the boiling point of water is. 5. The density of water is the largest at 1 103 kg m.
Water is a non-toxic inorganic substance composed of hydrogen and oxygen. At normal temperatures and pressures, it is a colorless and odorless transparent liquid that is known as the source of human life. Water, including natural water (rivers, lakes, atmosphere, water, seawater, groundwater, etc.), contains impurities, distilled water is pure water, artificial water systems (through a chemical reaction in which hydrogen atoms combine with water).
Water is one of the most common substances on Earth. It is an important resource for all life, including inorganic chemistry and humans. Water plays an important role in the evolution of life.
It is non-renewable in the narrow sense and renewable in the broad sense.
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The characteristics of water are:
1. Ice that turns solid below zero degrees is hard and brittle.
2. Above zero degrees is liquid water, which can flow.
3. It can be turned into water vapor, evaporated, and turned into clouds and mist.
4. Most substances can be dissolved in water.
5. Water is the source of life, and the survival of animals and plants is inseparable from water.
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1. Water is an inorganic substance composed of hydrogen and oxygen, which is non-toxic, colorless and odorless transparent liquid at room temperature and pressure, and is known as the source of human life.
2. Pure water can conduct electricity, but it is very weak and belongs to an extremely weak electrolyte. Water in daily life has more positive and negative ions due to the dissolution of other electrolytes, and the conductivity is enhanced.
3. The forms of water are: solid, liquid, gaseous, supercritical fluid, ultrasolid, superfluid, fermion condensate, plasma, Bose-Einstein condensate and so on.
4. When the air pressure of water is a standard atmospheric pressure, that is, the boiling point of the time is.
5. The freezing point of water is 0.
6. The density of water is the largest at 1 103 kg m3.
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There are 6 characteristics of water, which are high boiling point, high heat of evaporation, high heat capacity, abnormal expansion, good solvent, and continuous association. Water is an inorganic substance composed of two elements, hydrogen and oxygen. It is a colorless and odorless transparent liquid at room temperature and pressure, which is known as the source of human life and is an important substance to maintain life.
Pure water is a very weak electrolyte with very weak electrical conductivity. Water in daily life has more anions and cations due to the dissolution of other electrolytes, so it has more obvious conductivity.
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Fluidity is one of the most important characteristics of water and represents a characteristic of life. All living life, including plants and animals, especially animals, will be inextricably linked and inseparable from water. One of the main factors in this is that water has the characteristics of fluidity, because of the flow, it will be alive, and there will be life at all.
If it doesn't flow, it stops flowing, and life is over.
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Water is an inorganic substance composed of hydrogen and oxygen, which is a colorless and odorless transparent liquid at room temperature and pressure. Water is one of the most common substances on Earth, an important resource for the survival of all life, including humans, and the most important component of living organisms.
Characteristics of water: 1. Debater ice, which has become solid below zero, is hard and brittle;
2. Above zero degrees is liquid water, which can flow.
3. Water evaporation will become water vapor and stove, and water vapor will become clouds and mist and clouds;
4. Most substances can be dissolved in water;
5. Water is the source of life, and the survival of animals and plants is inseparable from water.
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The characteristics of water are:
1. Ice that turns solid below zero degrees is hard and brittle.
2. Above zero degrees is liquid water, which can flow.
3. It can be turned into water vapor, evaporated, and turned into clouds and mist.
4. Most substances can be dissolved in water, such as sugar, salt, gouache of various colors, and even air.
5. Water is the source of life, and the survival of animals and plants is inseparable from water.
So if there is water on a planet, there is a possibility of life.
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