Thermodynamic process | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-25

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Thermodynamic_process


00:01:41 1 Kinds of process
00:01:51 1.1 Thermodynamic process
00:03:48 1.2 Cyclic process
00:04:52 1.3 Flow process
00:05:48 2 A cycle of quasi-static processes
00:06:52 3 Conjugate variable processes
00:07:11 3.1 Pressure - volume
00:08:49 3.2 Temperature - entropy
00:10:15 3.3 Chemical potential - particle number
00:11:23 4 Thermodynamic potentials
00:11:46 5 Polytropic processes
00:12:30 6 Processes classified by the second law of thermodynamics
00:12:52 6.1 Natural process
00:13:22 6.2 Fictively reversible process
00:14:13 6.3 Unnatural process
00:14:30 6.4 Quasistatic process
00:15:00 7 See also



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SUMMARY
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Classical thermodynamics considers three main kinds of thermodynamic process: change in a system, cycles in a system,  and flow processes.
Defined by change in a system, a thermodynamic process is a passage of a thermodynamic system from an initial to a final state of thermodynamic equilibrium. The initial and final states are the defining elements of the process. The actual course of the process is not the primary concern, and thus often is ignored. This is the customary default meaning of the term 'thermodynamic process'. In general, during the actual course of a thermodynamic process, the system passes through physical states which are not describable as thermodynamic states, because they are far from internal thermodynamic equilibrium. Such processes are useful for thermodynamic theory.
Defined by a cycle of transfers into and out of a system, a cyclic process is described by the quantities transferred in the several stages of the cycle, which recur unchangingly. The descriptions of the staged states of the system are not the primary concern. Cyclic processes were important conceptual devices in the early days of thermodynamical investigation, while the concept of the thermodynamic state variable was being developed.
Defined by flows through a system, a flow process is a steady state of flows into and out of a vessel with definite wall properties. The internal state of the vessel contents is not the primary concern. The quantities of primary concern describe the states of the inflow and the outflow materials, and, on the side, the transfers of heat, work, and kinetic and potential energies for the vessel. Flow processes are of interest in engineering.