With the assumptions of Example 18.4 (Section 18.1), at what altitude above sea level is air pressure 90% of the pressure at sea level?
Solution 17E Step 1: The calculation in example 18.4 shows, the pressure decreases exponentially with the increase in altitude. P = P e0p ( Mgy / RT)-----------------(1) At the sea level the pressure is 1.013 × 10 Pa. The pressure must be 90 %of the pressure at the sea level. So, the pressure will be, 1.013 × 10 Pa × 90 % = 0.9117 × 10 Pa. 5
Textbook: University Physics
Author: Hugh D. Young, Roger A. Freedman
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