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Scan the biography of John Dalton. Put questions to the given answers




John Dalton was born September 6, 1766, in England and died July 27, 1844, in Manchester. A chemist and physicist, he developed the atomic theory of matter and hence is known as one of the fathers of modern physical science. Dalton spent most of his life in Manchester. He began his studies of meteorology in 1787. He made valuable observations concerning, the trade winds, and the cause of rain. He determined the point of the maximum density of water. In chemistry, his major work began around 1800.

Dalton developed the law known as Dalton's Law of partial pressures. Dalton's Law states that the total pressure of gas is equal to the sum of the partial pressures of the individual component gasses. The partial pressure is the pressure that each gas would exert if it, alone, occupied the volume of the mixture at the same temperature. This empirical relation was stated in 1801. It follows from the kinetic theory of gasses under the assumption of a perfect (ideal) gas, and assumes no chemical interaction between the component gasses. It is approximately valid for real gasses at sufficiently low pressures and high temperatures.

He also found that gasses expand as their temperature is raised. Further experiments showed the solubility of gasses in water, the rate of diffusion of gases, and the constancy of composition of the atmosphere. Dalton determined the relative weights of atoms, developed the laws of definite and multiple proportions, and finally formulated the atomic theory, which states that all elements are composed of tiny, identical, and indestructible particles. Many of these findings were included in the New System of Chemical Philosophy.

 

1. --------------------------- In England.

2. --------------------------- No, he was a chemist and physicist.

3. --------------------------- Physical science.

4. --------------------------- He developed the law of partial pressures.

5. ---------------------------- Yes, he formulated the atomic theory.

6. ---------------------------- The New System of Chemical Philosophy.

15. Scan the article “Vacuum Technology Developed to Control Insects in Wood.” Divide the text into logical parts.

Virginia Tech wood scientists hope that their vacuum-drying project will benefit wood pallet and container manufacturers and hardwood sawmill businesses across the nation. The vacuum controlling system eliminates the need for a heating system, saves energy, and does not release ozone-depleting chemicals into the earth’s atmosphere," says Zhangjjng Chen, one the researchers working on the project at the Center for Unit Load and Design in the wood science and forest products department of Virginia Tech’s College of Natural Resources.
"Plant sanitary measures currently require that wood pallets and containers, which pack goods that are imported or exported, should be heat-treated or fumigated", Chen explains. In response to these requirements, the Center for Unit Load and Design is developing the basis for vacuum control of insects in solid wood packaging materials, which would serve as an alternative to the current method.
Chen and his research partners project that low pressure, achieved by applying a vacuum to a system, will create an environment sufficiently low in oxygen that will eliminate the insects in several hours to days. Their research data indicates that there may be an opportunity to apply this technology to eliminate insects in wood. The material being tested is freshly cut red oak. same. Experts believe that the Asian Longhorn Beetle was introduced in America via infested shipping materials.
Principal investigators responsible for the vacuum control project include Virginia Tech’s wood science and forest products research specialist Zhangjjng Chen, professor Marshall White, and entomologist professor William H. Robinson. Chen and White work with the wood and moisture relationship that occurs in vacuum drying. Robinson has extensive knowledge on wood insects.




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