ABSTRACT
This chapter defines the equation of state for an ideal gas. It also defines the specific heats for an ideal gas and the relationship between them. The chapter explores the basic relationships for an ideal gas undergoing an adiabatic process. It explains the changes that take place during a two-phase process. The chapter introduces the saturated conditions, dryness fraction and superheated conditions for a two-phase fluid. It implies a study of all the properties necessary to define the state of a fluid, in reality it is proposed to concentrate on those properties necessary to analyse processes within a closed thermofluid system. The state of a fluid can be defined by two independent properties. In the case of a wet vapour, both the saturation temperature and the pressure are dependent on each other, so it is only necessary to use one of these as an independent property. One further independent property is required to define the state of a wet vapour.
