Isobaric Process Relations — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Isobaric Process Relations This set of relations applies when the external pressure remains constant throughout the thermodynamic process (isobaric process). Start with the First Law of Thermodynamics: Q = U + W. For an isobaric process, the work done is W = P V. The internal energy change is U = nC v T. Substituting into the First Law yields: Q = nC v T + P V. Using the Ideal Gas Law (P V = nR T) and the definition of Q = nC p T, we get the full set of relations. P = constant T > 0 K n 0 Confusing the molar specific heat at constant pressure (C p) with the molar specific heat at constant volume (C v). Forgetting to include the work term (W) when calculating heat transfer (Q) using the First Law. Assuming that U = 0 when the gas is at constant pressure (internal energy only depends on temperature).