CHAPTER 1 THE PROBLEM AND ITS BACKGROUND Introduction PROLIFERATION OF CHINESE COSMETIC AND MILK PRODUCTS WITH HIGH MERCURY CONTENT – China has been forced to deal with tainted milk products and other contaminated food products in past years‚ particularly with the melamine milk scandal that killed six children and sickened 300‚000 more people in 2008. Some of Yili’s products were found contaminated with melamine at the time‚ along with several other dairy companies. Melamine-tainted food
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19.1 P.O. Air Pressure and Wind P.1:1. Swirling in complex patterns‚ air moves constantly across Earth’s surface. Wind‚ which is the horizontal movement of air‚ helps to moderate surface temperatures‚ distribute moisture‚ and generally cleanse the atmosphere. 2. Although several forces affect the direction in which the air moves‚ differences in air pressure are what set the air in motion. A. What is Air Pressure? P.2:1. “light as air” is a common expression‚ but a column of air that stretches
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1911 to 1939 (in Perth Amboy‚ N.J.‚ USA)‚ and produced up to about 200‚000 tons of Bakelite annually. Bakelite replaced the very flammable celluloid plastic that had been so popular. The bracelet above is made of "butterscotch" Bakelite. BAROMETER: A barometer is a device that measures air (barometric) pressure.
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to the ocean floor at a depth of 10 m as shown in the figure. A mercury barometer located inside the shell reads 765 mm Hg‚ and a mercury U-tube manometer designed to give the outside water pressure indicates a differential reading of 735 mm Hg as illustrated. Based on these data what is the atmospheric pressure at the ocean surface. mercury=133 kN/m3‚ sea water=10.1 kN/m3 4) A partitioned tank as shown contains water and mercury. What is the gage pressure in the air trapped in the left chamber
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shaped tube. There are two bulbs of alcohol at the top of the tube. These cannot be seen on this thermometer. These expand or contract as the temperature changes. They then push round the indicator liquid to show the temperature. This example has no mercury‚ and is therefore safer. You get to see the temperature twice‚ it should show the same temperature on both scales. Both Celsius scales show 19 °C Six’s thermometer is a registering thermometer which can record the maximum and minimum temperatures
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A barometer is a widely used weather instrument that measures atmospheric pressure (also known as air pressure or barometric pressure) - the weight of the air in the atmosphere A barometer is an instrument used to measure atmospheric pressure. It can measure the pressure exerted by the atmosphere by using water‚ air‚ or mercury. From the variation of air pressure‚ one can forecast short-term changes in the weather. There are two main types of barometers – Mercury Barometers newer digital friendly
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Discuss your physics questions online at www.physics4spm.com 3 FORCES AND PRESSURE 3.1 UNDERSTANDING PRESSURE Pressure is force per unit area Pressure = Force Area P= F A 1. Define Pressure 2. State pressure’s formula 3. State relationship between pressure and area. 4. Describe applications involving High Pressure Increasing the pressure by reducing the area A sharp knife has a very The studs on a football small surface area on its boot have only a small cutting edge so that high area of contact
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Torricelli was born on 15 October in 1608 in Faenza in the Province of Ravenna. He was an Italian physicist and mathematician‚ best known for his invention of the barometer. His father was a textile worker and the family was very poor. Seeing his talents‚ his parents sent him to be educated under the care of his uncle‚ Jacobo‚ a Camaldolese monk‚ who first ensured that his nephew was given a sound basic education. He then entered young Torricelli into a Jesuit College in 1624‚ possibly the one in
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Question 3.54‚ 3.55 and 3.56 from Applied Fluid Mechanics by Mott and Untener (7th Edition) Page 73 and 74. 7. What is the barometric pressure reading in mm of mercury corresponding to 101.3kPa(abs)? 8. A barometer reads 745mm of mercury. Calculate the barometric reading in kPa(abs). 9. The barometric pressure is reported to be 730mm of mercury. Calculate the atmospheric pressure in kPa(abs). 10. Question 3.65‚ 3.66 and 3.67‚ 3.71 and 3.72 from Applied Fluid Mechanics by Mott and Untener (7th Edition)
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Conceptual Physics 11th Edition Chapter 14: GASES © 2010 Pearson Education‚ Inc. This lecture will help you understand: • • • • • • • The Atmosphere Atmospheric Pressure The Barometer Boyle’s Law Buoyancy of Air Bernoulli’s Principle Plasma © 2010 Pearson Education‚ Inc. The Atmosphere Atmosphere • Ocean of air • Exerts pressure The Magdeburghemispheres demonstration in 1654 by Otto von Guericke showed the large magnitude of atmosphere’s pressure. © 2010
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