Exercise 4: Atmospheric Moisture Suggested Reading: Hess, pp 132-138 KEY TERMS:
ID: 291474 • Letter: E
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Exercise 4: Atmospheric Moisture Suggested Reading: Hess, pp 132-138 KEY TERMS: Absolute Humidity, Relative Humidity, Saturation Capacity, Dew Point, Warm air has relatively greater capacity to hold water vapor than does cooler air. As air warms, its capacity to hold moisture increases at an increasing rate; this means that if a source of moisture is available the air will absorb it by the process of evaporation. As air cools, its capacity to hold water vapor diminishes; it gives up moisture by the process of condensation (forming clouds or fog) and possibly precipitation. The graph below shows the water vapor capacity of air at different temperatures. This water vapor capacity is also known as the saturation capacity (SC) -15° -10-5 0° 5 10° 15° 20° 25 30 35°C 40 15 O u 30 2 20 5 40° 60° 80 100°F 0 2 (There are exactly 7,000 grains in a pound)Explanation / Answer
1)
Temp = 100F
SC = 20 grn/ft3 ( by graph)
AH = 1.8 grn/ft3
RH= AH/SC x 100 = 1.8/20 x 100 = 9%
Temp = 70F
SC = 8 grn/ft3 ( by graph)
AH = 1.8 grn/ft3
RH= AH/SC x 100 = 1.8/8 x 100 = 22.5%
Temp = 50F
SC = 4 grn/ft3 ( by graph)
AH = 1.8 grn/ft3
RH= AH/SC x 100 = 1.8/4 x 100 = 45%
Temp = 30F
SC = 2 grn/ft3 ( by graph)
AH = 1.8 grn/ft3
RH= AH/SC x 100 = 1.8/2 x 100 = 90%
2)
Temp = 70F
SC = 8 grn/ft3 ( by graph)
AH = 3.6 grn/ft3
RH= AH/SC x 100 = 3.6/8 x 100 = 45%
3)
Temp = 50F
SC = 4 grn/ft3 ( by graph)
AH = 3.6grn/ft3
RH= AH/SC x 100 = 3.6/4 x 100 = 90%
4)
Temp = 90F
SC = 15 grn/ft3 ( by graph)
AH = 5 grn/ft3
RH= AH/SC x 100 = 5/15 x 100 = 33.33%
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