Chapter 1 - Introduction and basic concepts. The objectives of Chapter 1 are to: Identify the unique vocabulary associated with thermodynamics through the precise definition of basic concepts to form a sound foundation for the development of the principles of thermodynamics; review the metric SI and the English unit systems that will be used throughout the text; explain the basic concepts of thermodynamics such as system, state, state postulate, equilibrium, process, and cycle; review concepts of temperature, temperature scales, pressure, and absolute and gage pressure.