Isobaric process is described with equation:

Question

BlackTom AI · Accepted Answer

The prompt asks for statements describing an isobaric process, and we have two candidate options to evaluate.
Option a (c. pV0 = constant): This would imply that the product of pressure and an initial volume is constant. In general thermodynamics, an isobaric process keeps pressure constant while volume changes, so p is fixed and V varies with temperature. There is no standard rule that p times a fixed initial volume remains constant for an isobaric process. Therefore this statement is not a general description of an isobaric process and is incorrect.
Option b (e. p = constant): By definition, an isobaric process maintains constant pressure throughout the process. This aligns exactly with the concept of isobaric change, regardless of how other state variables (like volume or temperature) change. Hence this statement is correct.
Additional context (why the other common relation does not apply here): If pressure is constant, the ideal gas law pV = nRT gives V ∝ T, so volume changes with temperature, not staying fixed. The expression pV = constant corresponds to a process at constant temperature (isothermal) for a fixed amount of gas, which is not the defining characteristic of an isobaric process. Hence it does not describe isobaric behavior.
In summary, only the statement p = constant accurately describes an isobaric process; the pV0 = constant form does not represent a general isobaric relationship.

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