70 60 50 31 30 25 25 20 12.4 15 10 6.2 0 100 200 300 400 500 600 700 80 900 1013

Question

70 60 50 31 30 25 25 20 12.4 15 10 6.2 0 100 200 300 400 500 600 700 80 900 1013.2 Figure 7.1 Atmospheric pressure profile graph the standard atmosphere-from the surface to 70 km. 2. The information in Table 7.1 allows a determination of the rate of pressure decrease with altitude, which is not at a constant rate. Remember that half of the weight of the total atmosphere occurs below 5500 m (18,000 ft): at that altitude only about half of the total atoms and molecules of atmospheric gases remain to form the mass of the atmosphere. Determine the decrease in pressure between the following altitudes. Ex- press the difference in millibars and inches of mercury. (Conversions are presented earlier in this section.) I km interval difference in pressure: 10 km interval difference in pressure: 0 and 1 km 114.49 mb: 3.381 2 and 3 km 3mb: 2 in 10 and 20 km 20 mb: S and 6 kmemb: 2 in. 20 and 30 km A3.32 mb; 8 and 9 km 49.S mb: in. 40 and 50 km _2 mb: in. 0 and 10 km 1748.26 mb:2207 in. in. 23 in. in. mb; 0005 m. mb;?1.2a-in. 60 and 70 km en u 14.49 mbx-0295 in 'nb-3.38 inl 9and 10km A3.O Show conversion work here: 3. Using the graph you prepared in Figure 7.1, approximate the answers to the following (assuming standard atmosphere conditions): a) Mount Everest's summit is 8850 m (29,035 ft) above sea level. What is the barometric pressure there according to the standard atmosphere? 320 mbl

Explanation / Answer

Air pressure at Mount Mckinley = 460 mb

Air pressure at Mount Whitney = 620 mb

Air pressure at Yellowstone NP = 800 mb

Air pressure at Petronas tower = 1013 mb

Percentage of the atmosphere below the aeroplane at 12000 m =

Total pressure = 1013 mb

Pressure at 12000 m = 180 mb

Percentage = (1013-180)*100/1013 = 82.23 %

Atmospheric pressure decreases so rapidly with altitude because the heavier gases are confined near the earth surface due to the effect of gravity. Therefore as we go up the mass of the atmosphere starts decreasing. And so does the atmospheric pressure.

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