Practice question

**Quasi-static process** infinitely slow, system always near equilibrium, reversible, can be represented as continuous path on P-V diagram, non-quasi-static rapid process non-equilibrium, work W = ∫ P_ext dV, for quasi-static P_ext = P_system, work = ∫ P dV, zeroth law ensures temperature defined throughout quasi-static. The First Law of Thermodynamics is a statement of energy conservation: Δ Q = Δ U + Δ W . It implies that the total energy supplied to a system (as heat) equals the increase in internal energy plus the work done by the system. Using first law ΔU = Q - W, W = ∫ P dV, isobaric W