Question

An aircraft cruises at an altitude of 10,700 meters above sea level. Estimate the atmospheric pressure in bar at cruise altitude. Assume the acceleration of gravity is constant at g = 9.8 m/s". The average specific volume of the air is 1.334 m®/kg.

Answer 1

We can calculate the atmospheric pressure using the given formula:

`P = P_(o) - \rho* g* h`

where;

`P_(o) = 1.013 * 10^(5) pa`

`\rho = (1)/(V)`

`\rho = (1)/(1.334) = 0.75 kg/m^(3)`

h = 10,700 m

equating the following variables in above equation, we get;

`P = 1.013* 10^(5) - 0.75 * 9.8 * 10700`

P = 0.227 bar