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Gases

13.1 Pressure. Objective: to learn about atmospheric pressure and the way in which barometers work.To learn the various units of pressure.Pressure = total force applied to a certain area=F/Slarger force = larger pressuresmaller area = larger pressurePressure is caused by gas molecules colliding

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Gases

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    1. Gases Chapter 13

    2. 13.1 Pressure Objective: to learn about atmospheric pressure and the way in which barometers work. To learn the various units of pressure. Pressure = total force applied to a certain area=F/S larger force = larger pressure smaller area = larger pressure Pressure is caused by gas molecules colliding with container or surface. More forceful collisions or more frequent collisions mean higher gas pressure.

    3. Properties of Gases Expand to completely fill their container Take the Shape of their container Low Density much less than solid or liquid state Compressible Mixtures of gases are always homogeneous Fluid

    4. Units of Gas Pressure atmosphere (atm) height of a column of mercury (mm Hg, in Hg) torr Pascal (Pa) pounds per square inch (psi, lbs./in2) 1.000 atm = 760.0 mm Hg = 29.92 in Hg = 760.0 torr = 101,325 Pa = 101.325 kPa = 14.69 psi

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