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Lecture_8 - Todays Lecture Gases 5.1 Early Experiments 5.2...

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1 Gases Today’s Lecture 5.1 Early Experiments 5.2 The Gas Laws of Boyle, Charles and Avogadro 5.3 The Ideal Gas Law 5.4 Gas Stoichiometry 5.5 Dalton’s Law of Partial Pressures 1 Pressure a balloon expands when it is inflated with air, but what keeps it in its distended shape? h l f d b it’s not easy to measure the total force exerted by a gas so instead we consider the gas pressure Pa m N area force Pressure 2 = = = Vacuum the unit of pressure in the SI system is N/m 2 called the pascal 2 h = 760mm Hg for standard atmosphere note that a pascal is a rather small pressure unit, so units like the standard atmosphere (atm), mm Hg (called torr) and the kilopascal (kPa) are more commonly used 1 atm = 760 mm Hg = 760 torr = 101.325 kPa
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