![]() However, in relation to the universe, the entropy of the universe would increase as a result, in agreement with the Second Law of Thermodynamics. The area under the curve, which reflects the work done during expansion, is what determines how much heat the gas absorbs. However, this could also occur in a system where the work done on the system includes friction internal to the system, and heat is withdrawn from the system in just the right amount to compensate for the internal friction, so as to leave the entropy unchanged. Isothermal Process: Entropy change in isothermal process changes from S 1 to S 2 when gas absorbs heat during expansion. It means a process in which the entropy of the system remains unchanged as mentioned, this could occur if the process is both adiabatic and reversible. The word "isentropic" can be interpreted in another way, since its meaning is deducible from its etymology. Even though in reality it is not necessarily possible to carry out an isentropic process, some may be approximated as such. ![]() isovolumetric: constant volume, isenthalpic: constant enthalpy). Thermodynamic processes are named based on the effect they would have on the system (ex. Situations involving entropy changes are described. This process is idealized because reversible processes do not occur in reality thinking of a process as both adiabatic and reversible would show that the initial and final entropies are the same, thus, the reason it is called isentropic (entropy does not change). The entropy change is unknown (but likely not zero), because there are equal numbers of molecules on both sides of the equation, and all are gases. Such an idealized process is useful in engineering as a model of and basis of comparison for real processes. The work transfers of the system are frictionless, and there is no net transfer of heat or matter. ![]() In thermodynamics, an isentropic process is an idealized thermodynamic process that is both adiabatic and reversible. ![]()
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