AOS
midterm-practice_F16.pptx

# X plot shows the clausius clapeyron relationship

• Test Prep
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Plot shows the Clausius-Clapeyron relationship, which gives the saturation concentration of water vapor as a function of temperature (a) Suppose a blob of air hovering above the quad of the UCLA campus at 6AM has 10 grams per kilogram of moisture. Suppose further that dew has just begun to form on the quad at this early morning hour, indicating the air is at saturation. What is the temperature of the air? A: To identify the temperature of a saturated parcel of air, just go to the plot and get the number. T = 15C
Plot shows the Clausius-Clapeyron relationship, which gives the saturation concentration of water vapor as a function of temperature (b) Now the atmosphere begins to warm as the sun comes up. At some point later in the day, suppose the water vapor concentration has remained unchanged, but the atmosphere has warmed enough that the relative humidity has dropped to 50%. How warm is the air now? A: Remember that relative humidity is actual content of water vapor over the saturation value. Since you know the water content and the relative humidity you can estimate the saturation value. And now we know the temperature by projecting the point in the plot to the X axis T = 25C

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Plot shows the Clausius-Clapeyron relationship, which gives the saturation concentration of water vapor as a function of temperature (c) If the temperature increases steadily at a rate of 2 degrees C per hour beginning at 6AM, at roughly what time would the relative humidity dip down to 50%? T i = 15 C T f = 25 C T = T f - T i =10 C In this case we need to remember the values of Initial and Final Temperature. With that we just need a simple calculation 10 C will heat in 5 hours, then air will have 50% R.H. at 11 a.m.
Map shows the geographical distribution of the average total amount of water vapor in the atmosphere for the month of December (a) Why the values are lower in the high latitudes than in the tropics?

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Since the temperature in the tropics is higher
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• Spring '12
• seibt
• Precipitation, Water vapor, Pacific Ocean, Equator

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