Who is not familiar

You may ask, "Air? Who is not familiar with it, and what is wonderful about it?" Yes, air is very ordinary, but air also contains a lot of interesting knowledge, do you understand how air is composed? Do you understand why almost all living things can't live without air? Do you understand how carbon dioxide and water carve out the beauty of natural art? Do you understand how some poisonous gases are combined? First of all. We made a household book for the members of the air, and registered them in three categories. The first category consists of almost constant amounts of ammonia, oxygen and noble gases. In dry air without water vapor, ammonia accounts for 78 percent of the total volume, oxygen about 21 percent, and many other air members such as argon, nitrogen, and neon add up to only a few tenths of a percent. What a difference! The second category includes carbon dioxide, water vapor, dust particles and other variable content components. Strangely, they do not have a fixed proportion in the atmosphere, most of the time up to four percent of the total volume of the atmosphere, and less than one percent of the time. The third category is the members of the temporary account in the atmosphere, most of them are harmful gases, such as ammonia, sulfur dioxide, carbon monoxide, etc., there are thousands of kinds! In the constant content of the air member, people praise of course is oxygen. It is not that man harbors oxygen, but that oxygen does work for all living things. All living creatures need energy to carry out life activities, so where does this energy come from? Energy is stored in the organic matter of the organism, after the organism inhales oxygen, the oxygen has a wonderful chemical reaction with the organic matter that stores energy, and the organic matter is converted into inorganic matter, and the energy is released. This is the main property of oxygen. In addition, oxygen also contributes to plant photosynthesis, helps burn and many other properties. In the southwest limestone area of the motherland, there are strange peaks and caves, strange rocks like forests, and people are amazed at the superb skills of nature. So, who carved it? That's carbon dioxide and water. The main component of limestone is a calcium carbonate substance, when the water containing carbon dioxide and lime rock contact, calcium carbonate and carbon dioxide, water chemical reaction, the limestone dissolved into calcium bicarbonate, mixed in the water. After years of karst processes, the surface of the rock will appear in a variety of forms. At the same time, the water dissolved with calcium bicarbonate, due to the "escape" of carbon dioxide and the evaporation of water, will form a beautiful scenery such as stalactites and stalagmites. This is how carbon dioxide and water carve out the beauty of natural art. As mentioned before, there is a guy called sulfur dioxide in the air, and its "birth" is very interesting. Originally in coal, oil and other fuels, containing a small amount of sulfur, generally accounting for 1% to 7% of the total volume. Because combustion requires oxygen, during the combustion process, sulfur and oxidation, forming a gaseous form of sulfur dioxide released, sulfur dioxide can sometimes be converted into sulfur trioxide. In addition, air can also carry out a variety of combinations. For example, sulfur dioxide is vaporized with water to synthesize sulfuric acid fog, and nitric oxide and gas to synthesize nitrogen dioxide. They are toxic and contribute to air pollution.I have a warm and happy home. My father, mother, brother and I played a symphony of family harmony. Dad is in his late 50s, medium build. The hardships of the years caused him to show his white hair prematurely. Dad is very filial. I remember when I was young, my grandma was not in good health, and my father worked hard and took care of my grandma, working hard day and night, and never complained. Dad is also very hard-working, and everything in the family is always put away by dad. Especially the lively one in the middle of my small yard. Shed, is my father's masterpiece, is also the capital I show off among the children, a shed is my father built with steel pipes in the courtyard of my home, each steel pipe cross-tied, in a "field" shape, and coated with anti-rust paint, tall, very beautiful. Every spring season, dad put bitter melon ah, luffa ah, gourd ah seeds in the soil on both sides of the shed, such as seeds break the ground and sprout, grow tender seedlings. Dad fertilized and watered them and led them up to the shed with a rope. After dad so, so these seedlings and he like a magic scramble to climb up, soon covered the whole shed, and opened colorful flowers, bearing various shapes of fruit, hanging down on the shed. Many children and uncles and aunts came to my house to watch. Networking to identify and translate... My mother is hardworking and virtuous, gentle temper, popularity is very good, and she is in good order at home and abroad, which is the backbone of my family. My brother is the pride of our family. Just graduated from university this year, and admitted to Wuhan University postgraduate. However, my brother is not a nerd, every holiday home, will bring me a few story books and some small gifts. My home is a lovely home. Although the place is not big, but when I am injured, it can give me warmth, give me expectations, I love my home!