11/6/2023 0 Comments Dead space 2 chapter 2![]() Note that work done is a Path Function and not a property, thus it is dependent on the process path between the initial and final states. This is shown in the following schematic diagram, where we recall that integration can be represented by the area under the curve. We normally deal with a piston-cylinder device, thus the force can be replaced by the piston area A multiplied by the pressure P, allowing us to replace Adx by the change in volume dV, as follows: By convention positive work is that done by the system on the surroundings, and negative work is that done by the surroundings on the system, Thus since negative work results in an increase in internal energy of the system, this explains the negative sign in the above energy equation.īoundary work is evaluated by integrating the force F multiplied by the incremental distance moved dx between an initial state (1) to a final state (2). In all cases we assume a perfect seal (no mass flow in or out of the system), no loss due to friction, and quasi-equilibrium processes in that for each incremental movement of the piston equilibrium conditions are maintained. In this course we are primarily concerned with Boundary Work due to compression or expansion of a system in a piston-cylinder device as shown above.
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