The air temperature at ground level over a large, sunny meadow is 30°C. The rela
ID: 115661 • Letter: T
Question
The air temperature at ground level over a large, sunny meadow is 30°C. The relative humidity at ground level is 55% and the elevation is near sea level. a. The moist air rises off the meadow and cools off at the dry adiabatic lapse rate. At what altitude, in meters, can a cloud start to form? I.e., find the altitude of the cloud base. (Hint: Use the dew-point equation from the lecture notes and the wet-dry lapse rate chart, copy attached.) [2 pts] b. The clouds that form rise to a cloud-top altitude of 4,000 m. Above that the air is once again clear and dry. What is the air temperature at an elevation of 6,000 m, according to the attached lapse rate chart? [2 pts] c. Using the chart (not the lab equation), find the atmospheric pressure at 6,000 m, in units of kPa. [1 pt
Explanation / Answer
ANSWER:
Given,
The air temperature at ground level over a large, sunny meadow is 30°C. The relative humidity at ground level is 55% and the elevation is near sea level.
Relative humidity (RH) is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature. Relative humidity depends on temperature and the pressure of the system of interest. It requires less water vapor to attain high relative humidity at low temperatures; more water vapour is required to attain high relative humidity in warm or hot air.
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