End-of-Chapter Content End-of-chapter material provides an opportunity for review and application of concepts. A concise Summary provides an additional review tool and reinforces key learning objectives. This helps you focus on important concepts presented in the text. Test Your Knowledge questions enable you to assess your knowledge, identification, and comprehension of chapter material. Color Code The colors of the line art illustrations in the book have been selected and used consistently to represent specific aspects of a system (such as the different physical states and pressures of refrigerant in a system). A color key is provided to facilitate use of the book and understanding of system operations. States of Liquids or Gases High-pressure Liquid Low-pressure Liquid High-pressure Gas Water Water Vapor Copper Tubing Wood, Building Partitions Evaporators and Condensers Fuses and Other Electrical Components Iron, Steel, Other Metals Refrigerant Oil Motors and Compressors Metering Devices, Valves, Thermostats Low-pressure Gas Components and Materials Other Flow, Other Fluids Airflow Special features, materials, or components not otherwise coded. Note: In some schematic representations, additional colors may be used to aid understanding. They will be identified in a key accompanying the illustration. xi