Pressure - example
We identify this as a pressure problem with gravity, so we have:
Since P = 1.01 x 105 Nt/m2, ?air = 1.2 kg/m3 , and
g = 9.8 m/s2, we simply solve for h: h = P/rg =
(1.01 x 105 Nt/m2) / [(1.2 kg/m3)*(9.8 m/s2)] =
8,588 meters. (In fact, 90% of the earth’s atmosphere is within the first 16 kilometers of the earth’s surface.)