Isochoric Process Relations — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Isochoric Process Relations This set of relations applies specifically to thermodynamic processes occurring at constant volume (isochoric process). Start with the definition of work: W = P V. Apply the isochoric condition: Since V = 0, the work done is zero: W isoV = 0. Use the First Law of Thermodynamics: Q = U + W. Substitute W=0: This implies that the heat added ( Q) equals the change in internal energy ( U). Relate internal energy change to temperature: U = nC v T. V = 0 Temperature (T) must be in Kelvin (K). Assuming that zero work done means zero heat transfer (heat is still transferred, but it only changes internal energy). Confusing the constant volume specific heat ( C v ) with the constant pressure specific heat ( C p ). Forgetting that the relationship P/T = constant is only valid when volume is constant.