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Unformatted text preview: 1 Chapter 10 Gases Gases Gases Characteristics of Gases • Unlike liquids and solids, they ¾ Expand to fill their containers. ¾ Are highly compressible. Gases ¾ Are highly compressible. ¾ Have extremely low densities. • Pressure is the amount of force applied to an area. Pressure Gases • Atmospheric pressure is the weight of air per unit of area. P = F A Units of Pressure • Pascals ¾ 1 Pa = 1 N/m 2 Ba Gases • Bar ¾ 1 bar = 10 5 Pa = 100 kPa Units of Pressure • mm Hg or torr ¾ These units are literally the difference in the Gases heights measured in mm ( h ) of two connected columns of mercury. • Atmosphere ¾ 1.00 atm = 760 torr Manometer Used to measure the difference in pressure between atmospheric Gases pressure and that of a gas in a vessel. 2 Standard Pressure • Normal atmospheric pressure at sea level. • It is equal to Gases It is equal to ¾ 1.00 atm ¾ 760 torr (760 mm Hg) ¾ 101.325 kPa 1.00 atm = 760 torr (760 mm Hg) = 101.325 kPa Boyle’s Law The volume of a fixed quantity of gas at constant temperature is inversely proportional to the pressure. Gases As P and V are inversely proportional A plot of V versus P results in a curve....
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- Fall '09