chapter 5 final

chapter 5 final - Todays Entertainment Announcements What...

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Today’s Entertainment Announcements What questions do you have? Today: Atmospheric Pressure & Winds
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Introduction Pressure is the force something gives off applying to area--force/area Atm pressure: force per unit area 1013 mb average 2 sea level Exerted in all directions by gases, etc Function of density and temp
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Vertical and Horizontal Changes in Pressure Pressure decreases with height; non-linear due to compressibility Must count for elevation effects: calibrate measurement to sea level pressure Pressure will be less at P 2 than at P 1 due to pressure decreasing with height
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The Equation of State The relationship between pressure, temp, and density P=pRT; P=pressure; p=density T=temp R=constant AIR: if the pressure was high it would rise up and out of the tube; if it was low it would shoot up and go back down. Ex next slide Molecular movement in a sealed container. Pressure increased by increasing density (b) or temperature (c)
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Measurement of Pressure Mercury barometer: inverted tube filled with mercury Aneroid barometer: collapsable chamber that compresses Corrections to Barometer Readings Three corrections needed to ensure consistency: Elevation Air temp (for mercury; it affects density) Latitude (for mercury; affects gravity)
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Mercury (right) and aneroid (below) barometers Figures 6.2-6.3
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The Distribution of Pressure Horizontal pressure differences help generate weather Pressure maps depict isobars--lines of equal pressure; different elevations Pressure gradients Mean global pressures for January and July Figure 6.11
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chapter 5 final - Todays Entertainment Announcements What...

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