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Temp & heat - TemperatureandHeat January28,2010...

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Temperature and Heat January 28, 2010 ESPM/GEOG 1425 1
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Forecast Challenge Available on WebVista Submission due by this Friday 29 th at 5 pm
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Be sure to complete the course survey on WebVista
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Weather Briefing
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Recap
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6 The “Lazy W”
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Parcel of Air 1. Temperature ‐ Degree of “hotness” or “coldness” of a substance ‐Measure of the average kineSc energy of any substance Thermodynamic State of the Atmosphere
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2. Density Density = mass volume = kg m 3 Thermodynamic State of the Atmosphere - Mass of air molecules in a given volume
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3. Pressure Force = mass × acceleration = kg m s 2 = N Pressure = Force Area = Newton m 2 = Pascal Thermodynamic State of the Atmosphere
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States that air pressure, air density and air temperature are all interrelated * a change in one will cause a change in the other air pressure J m -3 (Pascal) air temperature (Kelvin) air density kg m -3 gas constant 287 J K -1 kg -1 P = ρ RT The EquaDon of State: The Ideal Gas Law
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Air parcel What happens to density when we increase the temperature?
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