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Dust's Travel Travel Essay 100 Words
Dust is the enemy of human health, so people especially hate it, because it carries many bacteria viruses and insect eggs flying around, spreading disease. Industrial dust, fiber dust can make workers suffer from a variety of incurable occupational diseases, too much dust will also cause environmental pollution, affecting people's normal life and work, inducing human respiratory diseases and so on.

But, the dust credit must not be erased. If there is no dust in the atmosphere, the sunlight will not be absorbed, reflected, scattered and refracted, the sky will be a blank slate, there is no wind, snow, rain and dew, there is no sunshine, rainbow. As dust is hygroscopic particles, without it as the core, the air can not condense the water vapor, the clouds in the sky is difficult to form, the ground lost the cloud cover, it will become arid and barren, the weather is either too hot, or too cold. Without dust, many of the universe's harmful rays would break into the Earth's surface unimpeded and pose a deadly threat to humans and all sorts of living things.

Besides these benefits of dust, it condenses water vapors. It makes them turn into water droplets, otherwise everything is wet.

Although dust is many things it is not, it is also immeasurably useful in that it allows the earth to gently capture the sun's energy, and also allows there to be enough condensation nuclei in the atmosphere to increase the chances of cloud and rain formation; and regulates the temperature of the earth's surface so that it's suitable for life to survive and reproduce.

Dust is very harmful to the computer, too much dust may block the CPU fan, so that the fan stops, resulting in the consequences of the CPU overheating burned, but also affects the contact between the various boards, but also may cause corrosion of the circuit board.

The dust also makes Pickering's ten years of hard work go down the drain. After Lovell predicted a Pluto, he observed it for more than a decade and never saw it. It wasn't until after the discovery of Pluto that he remembered he had lined it up, only, he thought it was a speck of dust.

Fifth grade book, lesson 12, "If There Was No Dust," by Zhou Yuan Gui. It also talks a lot about dust, so check it out!!!!

[edit]Types of Dust

I. Types of Dust

Dust can be roughly divided into three kinds according to the size of the particle size:

1. Powder Dust

Powder Dust is a particle that is produced and dispersed into the air as a result of crushing an object. Its particle size varies greatly, large visible to the naked eye, small need a high power microscope to see, the particle size is generally in 1μm to 10μm. its shape is irregular, but the composition is the same as before the generation of the material.

2. Condensation of solid smoke

Condensation of solid smoke is a material in the combustion, sublimation, evaporation and cohesion and other processes. Its particle size is generally in the 0.1μm to 1μm. it is different from dust, cohesion is very large, mostly in the process of melting metal substances formed in the gas, cooled in the air, condensed into a solid smoke, the shape of the particles is more regular.

Edited on 2015-02-06

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The dust of the trip - Jingdong 618 shopping Jingdong, to receive 10 billion shopping gold!

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The main content of "The Travels of Dust" is a little shorter

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The Travels of Dust Essay 300 Words

The Travels of Dust Dust is a finely dried and made into powdered grains of earth or other substances that have been turned into a microscopic portion of something; fine powder, the diameter of the particles of dust is generally The diameter of dust particles is generally between one hundredth of a millimeter and a few percent of a millimeter is invisible to the human eye. Dust is the enemy of human health, so people especially hate it, because it carries a lot of bacteria viruses and insect eggs flying around, spreading disease. Industrial dust, fiber dust can make workers suffer from a variety of incurable occupational diseases, too much dust will also cause environmental pollution, affecting people's normal life and work, inducing human respiratory diseases and so on. However, the merits of the dust must not be erased. If there is no dust in the atmosphere, the sunlight will not be absorbed, reflected, scattered and refracted, the sky will be a blank slate, there is no wind, snow, rain and dew, there is no sunshine, rainbow. As dust is hygroscopic particles, without it as the core, the air can not condense the water vapor, the clouds in the sky is difficult to form, the ground lost the cloud cover, it will become arid and barren, the weather is either too hot, or too cold. Without dust, many harmful rays from the universe would break into the surface of the earth unimpeded and pose a deadly threat to humans and all kinds of living things. In addition to these benefits of dust, it condenses water vapors. It makes them turn into water droplets; otherwise, everything is wet. Although there are many things that dust is not, but its credit is also immeasurable, it enables the earth to gently obtain the sun's energy, but also enables the atmosphere to have enough condensation nuclei, in order to increase the chances of the formation of clouds and rain; regulate the temperature of the ground surface, so that it is suitable for the survival and reproduction of life. Dust is very harmful to the computer, too much dust may block the CPU fan, so that the fan stops, resulting in the consequences of the CPU overheating burned, but also affect the contact between the boards, may also cause corrosion of the circuit board. Dust also makes Pickering's ten years of hard work go down the drain. After Lovell predicted a Pluto, he observed it for more than ten years and never saw it. It wasn't until after the discovery of Pluto that he remembered he had lined up to it, only, he thought it was a speck of dust. Fifth grade book, lesson 12, "If There Was No Dust," by Zhou Yuan Gui. It also talks a lot about dust, so check it out!!!! [Edit Paragraph] Types of Dust I. Types of Dust Dust can be roughly divided into three types according to the size of the particle size: 1. Dust Dust is produced and dispersed into the air as a result of the crushing of objects and particles. The size of the particle size varies greatly, large visible to the naked eye, small need a high power microscope to see, the particle size is generally in the 1μm to 10μm. its shape is irregular, but the composition of the material with the generation of the same material. 2. Condensed solid smoke Condensed solid smoke is a material in the combustion, sublimation, evaporation and cohesion and other processes. Its particle size is generally in the 0.1μm to 1μm. it is different from dust, cohesion is very large, mostly in the process of melting metal substances formed in the gas, cooled in the air, condensed into a solid smoke, the shape of the particles is more regular. 3. Smoke Smoke is in the wood, paper, cloth, oil, coal, cigarettes and other organic matter produced during combustion. Its particle size is generally below 0.5μm. Dust is a solid impurity, the shape is irregular, mostly angular and with gray, brown, black and other colors, and has a water absorption. When there is a large amount of dust in the air, and the relative humidity reaches a certain level, water vapor that is the formation of water droplets, so the dust is easy to be wet by water, but also easy to adsorb water. Then look at its chemical properties, the composition of the dust is more complex, it will sometimes provide the degradation of acid roots and metal ions. Some dusts are inherently acidic or alkaline, such as sulfuric acid fumes and photochemical fumes, and particles such as metal oxides are alkaline. In addition, dust particles have a very large surface area due to their small particle size, so they have a high adsorption capacity and can attract harmful substances in the air to their surfaces and become acidic or alkaline. Dust often contains clay and other substances, will absorb moisture in the air or archives made of materials, so that it undergoes hydrolysis reaction, decomposition of the gelatinous aluminum hydroxide. Its biological characteristics: due to the small size of mold spores, light weight, with the air moving around, and thus inevitably attached to the dust, so the dust is the ideal culture base for microorganisms, reproduction and disseminators. Microorganisms in the growth process will secrete mold containing enzymes and organic acids. Therefore, throughout the ages, people have always been ''diligent to brush, do not make the dust''. However, have you ever thought that human beings cannot live without dust? If there was no dust in nature, what would we be facing? Dust particles are generally between one ten thousandth and one millionth of a millimeter in diameter. The dust that can be seen by the human eye is the behemoth of dust, and fine dust can only be seen under a high powered microscope. The main sources of dust are soil and rocks. They are weathered and split into tiny particles. These particles float in the air along with other particles of organic matter. Dust absorbs some of the sun's rays while reflecting light in all directions, like countless point sources. The sunlight is reflected by the dust, which weakens its intensity and makes it softer. If there were no dust in the atmosphere, strong sunlight would make it impossible to open one's eyes. Interestingly, dust particles also have a "strange temperament" and tend to reflect the shorter violet, blue, and cyan colors of light, while "preferring" to absorb the longer wavelengths of other colors of light. The sky we see on the ground is blue because of the high dust content in the lower atmosphere. If there were no dust in the atmosphere, the sky would be white. Most dust has hygroscopic properties. The water vapor in the air must cling to the dust in order to condense into small water droplets. In this way, when the air is saturated with water vapor, the dispersed water vapor will cling? Dust and form stable water droplets that can float in the air for a long time. If there were no dust in the air, everything on the ground would be wet. Worse still, there could be no clouds in the sky, and no rain or snow could be formed to regulate the climate, and the water that evaporated from the ground to the sky above would not be able to return to the ground. If the water on earth becomes less and less, and finally dries up completely, living things cannot survive. In addition, because of these small droplets of water on the refraction of sunlight, there will be the evening sunshine, clouds, mist, rainbows and other meteorological natural scenery. If there is no dust in the air, nature will be more monotonous ah! The role of dust tells us that everything has its two sides.

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The main content of "Dusty's Journey" 50 words third grade?

The Journey of Dust mainly introduces us to the characteristics of dust, its volume, size, source, and the danger to human health, which makes us realize that we must control dust and protect the environment for the sake of our health. Dust covers all the space around us and can only be seen when sunlight comes into a dark room. The amount of dust varies from place to place. Dust also has a big impact on weather changes. Dust can come from many, many sources, either from nature or from cities. Dust also induces diseases. Nowadays people are trying to make dust work for the benefit of mankind. Extended Information The Journey of Dust Fragment: Dust is a never-tiring traveler on Earth, drifting with the turbulence of the air. It travels almost everywhere in the air around us, from indoors to outdoors, from cities to the countryside, from flatlands to mountains, from deserts to oceans. A truly dust-free space can only be created in a laboratory. Under a clear sky, dust is invisible, and only when the sun's rays come through the gaps in the blinds and into the darkened room can countless amounts of dust be clearly seen fluttering in the air. Large dust can certainly be seen with the naked eye, but small dust is smaller than bacteria and cannot be observed with a microscope.

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The Wonderful World of Microbes In beautiful writing, you are enthralled and can't keep your hands off of it; in music, you are enraptured and immersed; in science and technology, you are awestruck and marveled. And in the world of microorganisms, you are often dazzled and filled with novelty. Recently, I read a book - The Journey of the Dust - which gave me more knowledge and understanding of microorganisms. Here, let me take you on a trip to the microbial world! Microorganisms, bacteria, are considered to be the "earth", except for the great deserts and snowy mountain tops, it is found in any corner of the earth. It is sometimes a bad guy, in the human respiratory tract to play havoc, in the nasal cavity, throat evil. Some "bacterial bullies" can also cause some diseases, which is worrying. But as long as we develop good hygiene habits will not appear disease. They also repeatedly invade the blood vessels, thanks to the white blood cells and antibodies, they can only look "blood" sigh. Once there is a shortage of white blood cells and antibodies, the consequences are unimaginable. They also in the milk, esophagus, intestinal cavity to start the war against human beings. And everything has its disadvantages and advantages, bacteria also have something to offer, such as essay ads

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