Final answer:
The statement that all isobaric processes are also polytropic is false because while isobaric can fit the form of a polytropic process (with n=0), polytropic processes can describe various types of processes, not just isobaric ones.
Step-by-step explanation:
Whether all isobaric processes are also polytropic is a question related to the characteristic processes in thermodynamics. The statement is false. An isobaric process is defined by constant pressure; however, a polytropic process is described by the equation pV^n = constant, where n is the polytropic index. While all isobaric processes can be described by this polytropic equation by setting n to 0 (since p = constant), not all polytropic processes are isobaric, because polytropic can also describe other types of processes, including isothermal and adiabatic ones, depending on the value of the polytropic index n. Therefore, while all isobaric processes can fit the form of a polytropic process (with n = 0), the reverse that all polytropic processes are isobaric is untrue due to the variable nature of n in different processes.