The birth of television is one of the greatest inventions of the 20th century. In modern society, life without TV is unimaginable. Black-and-white and color TVs of various models and functions have continuously flowed into factories, schools, hospitals and families all over the world from one assembly line, which is miraculously changing people's lives rapidly.
2. Nylon
Carothers, an American organic chemist, made polymers from adipic acid and hexamethylene diamine in 1935. Because both components contain six carbon atoms, they were called polymer 66 at that time.
He melted the polymer, extruded it with a needle and stretched it under tension, which is called fiber. This kind of fiber, polyamide 66 fiber, 1939 was named nylon after industrialization, and it was the earliest industrialized synthetic fiber variety.
3. Plastic
During the 65438+60s, due to the shortage of ivory in the United States, there was a lack of raw materials for making billiards. The earliest artificial plastic celluloid was patented in 1869. Although celluloid is the earliest artificial plastic, it is an artificial plastic, not a synthetic plastic. The first synthetic plastic was made of phenolic resin by pressing with a heating mold. It was made by Backlander, an American Belgian chemist of 19 10 in the early 20th century.
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Science and technology in the 20th century also made the following inventions:
1, plane
1903 12 17, the world's first manned plane flew into the blue sky in Kitty Hawk, North Carolina, USA. This plane is called "Voyager-1", and its inventors are American brothers wilbur wright and Orville Wright. ?
2. penicillin
Professor alexander fleming, a famous British bacteriologist, first invented the world-famous penicillin in 1928. Later, it was further studied and perfected by British pathologist Flory and German biologist Ernst Boris ernst boris chain. 194 1 clinical use, 1943 gradually popularized.
Penicillin is considered as the third greatest invention in World War II, alongside the atomic bomb and radar. Penicillin is an era when human beings bid farewell to bacteria without specific drugs, and it is a major breakthrough in the medical field. Since then, it has laid a protracted war between human beings and bacteria.