Fundamentals of Engineering Thermodynamics 8th Edition

Published by Wiley
ISBN 10: 1118412931
ISBN 13: 978-1-11841-293-0

Chapter 1 - Exercises: Things Engineers Think About: 6

Answer

We know atmospheric pressure reduces with the altitude. Lets take 10 floor height from lobby is approx. 30 m. In this case pressure difference between two levels = rho_air*g*H = 1.225*9.8*30 = 360 Pa. This 360 pa causes only 0.3% change in atmospheric pressure. Hence she shall not expect the air pressure on the two levels differ much.

Work Step by Step

We know atmospheric pressure reduces with the altitude. Lets take 10 floor height from lobby is approx. 30 m. In this case pressure difference between two levels = rho_air*g*H = 1.225*9.8*30 = 360 Pa. This 360 pa causes only 0.3% change in atmospheric pressure. Hence she shall not expect the air pressure on the two levels differ much.
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