+1 vote
in Fluid Mechanics by (118k points)
If the atmospheric pressure at sea level is 7.5 N/cm2, determine the pressure at a height of 3000m assuming the pressure variation follows isothermal law. The density of air is given as 1.2 km/m3.

(a) 4.68 N/cm^2

(b) 9.37 N/cm^2

(c) 2.34 N/cm^2

(d) None of the mentioned

I got this question in examination.

This intriguing question comes from Pressure at a Point in Compressible Fluid in portion Pressure and Its Measurement of Fluid Mechanics

1 Answer

+2 votes
by (362k points)
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Best answer
Correct choice is (a) 4.68 N/cm^2

To explain: pressure at any height Z = p*e^-gZ/RT

                                                             =75000*e ^ -9.81*3000*1.2/75000

= 4.68 N/cm^2.

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