Thermodynamics: An Engineering Approach 8th Edition

Published by McGraw-Hill Education
ISBN 10: 0-07339-817-9
ISBN 13: 978-0-07339-817-4

Chapter 2 - Energy, Energy Transfer, and General Energy Analysis - Problems - Page 98: 2-20C

Answer

A work interaction.

Work Step by Step

Since you need a force to move the piston and compress the gas, you are doing work on it.
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