BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
What is oil? Detailed answer Directory / Big encyclopedia. Questions for quiz and self-education Did you know? What is oil? Oil brings great benefits to mankind. With its help, we get light, heat, it sets in motion cars, tractors, planes and ships. Without it, all engines will stop due to friction. Industrial alcohol, paraffin, fuel, lubricating oils, industrial fat, resins, asphalt and other products are obtained from petroleum. What is oil? This word comes from the Latin language and means "stone oil". How did she appear? Scientists believe that it was formed from plants and animals that lived many years ago in the warm waters of the oceans that covered the earth's surface. Dying off, animals and plants accumulated at the bottom. Over time, millions of tons of sand and silt covered them. Under pressure, silt and sand turned into solid rocks. The remains of plants and animals turned into a dark liquid collected in the pores of the rock. The movement of the earth's crust turned part of the seabed into land. A certain amount of this liquid appeared on the earth's surface, where it was discovered by man. Oil has been used by man for thousands of years. In ancient times, the Chinese and Egyptians used it as a medicine. Long before our era in ancient India, oil was used for lighting and as a fuel. In ancient times, oil was used for torches, added in the manufacture of bricks, it was coated with baskets and ship bottoms so that they would not let water through. The American Indians also used oil for various purposes. When the first white settlers arrived in America, they adopted from the Indians how to use "stone oil" in the treatment of certain diseases. Oil extracted from wells is practically not used anywhere. It needs to be recycled. This process is based on the fact that the composition of oil includes solid, liquid and gaseous substances. When heated, the oil is separated into its constituent components, which were combined by nature together. This is made possible by the fact that each component of oil boils and evaporates at different temperatures. First, gasoline is released, then paraffin, gas, oils and lubricants. Author: Likum A. Random interesting fact from the Great Encyclopedia: What are ultraviolet rays? Light, heat, x-rays and ultraviolet rays are all types of radiation. The wavelengths of radiation have a huge range. The longest are radio waves, the shortest are gamma rays. Halfway between the longest and shortest wavelengths are light waves, or visible radiation. But the light rays themselves include a large number of waves of different lengths. Each color is a wave of a certain length. Red light is the longest wavelength visible to man. Then comes orange, followed by yellow, green, cyan and violet, which has the shortest wavelength. Immediately after the violet wavelength comes the radiation that scientists call the ultraviolet range. These waves are emitted by the Sun, as well as lamps specially created for this purpose. Ultraviolet rays exist in the wavelength range of violet to more than 1 wavelengths per centimeter. Because UV rays are shorter than others, they are penetrating. At the same time, only half of the ultraviolet rays sent by the Sun reach the Earth. Many of them are absorbed by the Earth's atmosphere far from its surface.
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