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January 30, 2008

January 30, 2008. Barometers, Pressure, Pressure Conversions Boyle’s Law Homework Page 480 -- # 1, 2, 3, 4ab, 5ab, 7abc. Aneroid Barometer. How to Measure Pressure. Barometer measures atmospheric pressure. vacuum. P Hg. P atm.

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January 30, 2008

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  1. January 30, 2008 • Barometers, Pressure, Pressure Conversions • Boyle’s Law • Homework • Page 480 -- # 1, 2, 3, 4ab, 5ab, 7abc

  2. Aneroid Barometer How to Measure Pressure Barometer • measures atmospheric pressure vacuum PHg Patm Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

  3. vacuum mercury (Hg) air pressure barometer: device to measure air pressure

  4. Empty space (a vacuum) Hg Weight of the mercury in the column Weight of the atmosphere (atmospheric pressure) Barometer Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 401

  5. Barometer Water column (34.0 ft. high or 10.4 m) • Mercury filled 760 mm = 1 atm • Water filled 10400 mm = 1 atm Atmospheric pressure Mercury column (30.0 in. high or 76 cm) The barometer measures air pressure

  6. Barometers Mount Everest Sea level On top of Mount Everest Sea level

  7. Boiling vs. Evaporation Boiling point: atmospheric pressure = vapor pressure AIR PRESSURE 15psi VAPOR PRESSURE 15 psi Evaporation: molecules go from liquid to gas phase gas liquid

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