Thermodynamics pp 215-288 | Cite as

The First Law: Vapours and Gases in Closed and Open Systems

  • John Simonson
Part of the Foundations of Engineering book series (FES)


We shall begin this programme by looking at problems involving a vapour, usually steam, in closed systems. The system is initially in a known equilibrium state, and as a result of heat and work interactions at the boundary, proceeds to a second equilibrium state. We need to use the equation of the First Law applied to a closed system to solve such a problem. This was given in Frame 11 of Programme 3 as:
where the energy term E was shown in Frame 20 of Programme 3 to consist of internal energy, kinetic energy and potential energy. So what would be the First Law equation for problems with steam in closed systems?


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Copyright information

© J. Simonson 1993

Authors and Affiliations

  • John Simonson
    • 1
  1. 1.Mechanical EngineeringCity UniversityUK

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