Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 18 - Reading Check Questions (Comprehension): 23

Answer

Hot steam exerts pressure on the front side of the turbine blades. The condensation part of the cycle condenses the steam after it pushes past the turbine, and reduces pressure on the back side of the blades. The pressure difference results in a net force that turns the blades.

Work Step by Step

This is discussed on pages 346-347, and diagram 18.14 is helpful.
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