If the piston compresses the gas as it is moved inward, work is also done-in this case, on the gas. If the gas expands against the piston, it exerts a force through a distance and does work on the piston. Then how does a thermodynamic system do work? Figure 3.4 shows a gas confined to a cylinder that has a movable piston at one end. Work Done by a SystemĪ force created from any source can do work by moving an object through a displacement. Here, we want to understand how work is done by or to a thermodynamic system how heat is transferred between a system and its environment and how the total energy of the system changes under the influence of the work done and heat transfer.
Specifically, we elaborated on the concepts of heat and heat transfer in the previous two chapters. Here, we want to expand these concepts to a thermodynamic system and its environment. Examples and related issues of heat transfer between different objects have also been discussed in the preceding chapters. We discussed the concepts of work and energy earlier in mechanics. Calculate the work, heat transfer, and internal energy change in a simple process.Describe the work done by a system, heat transfer between objects, and internal energy change of a system.By the end of this section, you will be able to:
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