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Unformatted text preview: -2 , called a pascal ( 1Pa = 1 N/m 2 ) The atmospheric pressure at sea level is about 100 kPa Atmospheric pressure can be measured by using a barometer A glass tube with a length somewhat longer than 760 mm is closed at one end and filled with mercury The filled tube is inverted over a dish of mercury such that no air enters the tube Some of the mercury flows out of the tube, but a column of mercury remains in the tube. The space at the top of the tube is essentially a vacuum The dish is open to the atmosphere, and the fluctuating pressure of the atmosphere will change the height of the mercury in the tube The mercury is pushed up the tube until the pressure due to the mass of the mercury in the column balances the atmospheric pressure...
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