What is the knowledge of water?

Water is an indispensable substance in the bodies of animals and plants and in human bodies, and it can be said that there is no life without water. In addition, water is inseparable from food, clothing, housing and transportation in human life. Water is also an important raw material for industrial and agricultural production.

The amount of fresh water consumed in agricultural production accounts for 60%-80% of the total amount of fresh water consumed by human beings, and a large amount of water is also used in industry for production. Water also plays an important role in inland and marine transport.

There is a water molecule in one kilogram of water.

The details are as follows: The molar mass m of the water molecule is 18g mol.

Number of water molecules = n * na = na * m m = pcs).

Ways to protect water:

Always have some plastic buckets that can store water at home, generally washing vegetables and rice washing water can be used to water flowers, and the cleanest water for washing vegetables is collected for flushing toilets; The dirtier water is collected for flushing the toilet and the cleaner water is used for the first wash.

Wash the laundry with water, mop the floor, broom floor, and then flush the toilet. The second washing water for washing clothes is to wipe doors, windows, furniture, shoes and socks, etc.

Water has a pH of 7 and is a neutral liquid, and water in nature is a mixture, the smallest oxide, and the most commonly used solvent. Less than 1% of the fresh water that can be drunk on the planet, 60%-70% of the human body is water, and 2 3 of the cells are water, with an average of 1 cubic meter of water per person per year.

1.Water is the source of human life.

2.Water is the most abundant natural substance on the Earth's surface, covering more than 71% of the Earth's surface. The Earth is a veritable balloon of water.

3.People are made of water, the proportion of water in the human body accounts for about 90 when the fetus, 80 when the baby, 70 for the young and middle-aged, and only 60 50 when the elderly, and the process of aging is the process of water loss.

4.There are three states of water, namely: solid, liquid, and gaseous.

However, water has more than three states: supercritical fluid, supersolid, superfluid, fermion condensate, and plasma state.

5.The simplest hydroxide, the chemical formula H2O. Colorless, tasteless, odorless liquid, at standard atmospheric pressure (101325 Pa), freezing point 0, boiling point 100, 4 at the highest density, 1 gram ml.

6.Lake Baikal was known as Beihai in ancient China, and was once the main activity area of northern China's tribes, and legend has it that Li Bai was born in the city of Broken Leaves next to Lake Baikal.

Messages were released confirming the discovery of multiple water sources on the lunar surface.

There is water ice on the moon, so humans don't have to carry a lot of water to colonize the moon.

8.The place with the most water in the universe.

Astronomers have discovered the largest reservoir in the universe known 12 billion light-years from Earth, containing 140 trillion Earth's water volumes, an inexhaustible source!

Cosmic reservoirs, water exists in the form of gases.

9.If all the ice in the Arctic and Antarctic melted, and all the water on Earth was evenly distributed on the Earth's surface, then it would be 3,700 meters deep.

10.Ninety-seven percent of Earth's water is salty, and some of it is still frozen beneath the polar ice caps, so less than 1% of the planet's available freshwater is available.

1. Organic matter in water: mainly refers to humic acid and fulvic acid compounds in water, pollutants in domestic sewage and industrial wastewater. It contains animal and plant fibers, oils, grains, dyes, organic raw materials, etc.

2. Peculiar smell in water: the odor emitted by the reproduction and decay of aquatic animals, plants or microorganisms in the water; The smell emitted by the decay and decomposition of organic matter in the water. <

1. Organic matter in water: mainly refers to humic acid and fulvic acid compounds in water, pollutants in domestic sewage and industrial wastewater. It contains animal and plant fibers, oils, grains, dyes, organic raw materials, etc.

The organic matter in the water has a common characteristic, that is, it needs to oxidize and decompose, which needs to consume dissolved oxygen in the water, resulting in a lack of oxygen in the water, and at the same time, spoilage and fermentation will occur, so that bacteria breed, deteriorate water quality, and damage the water body. Excessive organic matter is one of the main causes of water pollution.

2. Peculiar smell in water: the odor emitted by the reproduction and decay of aquatic animals, plants or microorganisms in the water; The smell emitted by the decay and decomposition of organic matter in the water. dissolved gases of water such as SO2, H2S, NH3; the smell of dissolved salts or soil, and the odor of petroleum and phenols contained in industrial wastewater discharged into water bodies; The smell of chlorine is added to the disinfection process.

3. Turbidity of water: Because the water contains suspended and colloidal particles, the degree of turbidity produced by the original colorless and transparent water is called turbidity. Turbidity is an optical effect that is the degree to which light is obstructed from passing through a water layer, indicating the ability of the water layer to scatter and absorb light.

4. Chromaticity of water: The chromaticity of water is an index for quantitative determination of the color of natural water or various treated waters. The cause of color is due to humus, organic matter or inorganic matter that dissolves in water.

Industrial wastewater can also cause water bodies to produce a wide variety of colors. Such as clay - yellow, iron oxide - brown, sulfide - light blue, algae - green, putrefactive organic matter - black-brown.

5. The hardness of water: some metal cations in the water, combined with some anions, in the process of water being heated, due to evaporation and concentration, it is easy to form scale, which adheres to the heating surface and affects the heat conduction, and the total concentration of these metal ions in the water is called the hardness of water. Because the concentration of other metal ions in water is very low, the concentration of calcium and magnesium ions in water is usually regarded as the hardness of water.