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Isobaric
An isobaric process is a process, in which the pressure remains constant. An isochoric process is a process, in which the volume remains constant. An isothermal process is a process, in which the temperature remains constant.
For an isobaric process we write ΔU = ΔQ - ΔW = ΔQ - P(V2 - V1), or, rearranging the terms, ΔH = ΔQ.