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Unformatted text preview: the system into the surroundings is negative . Week #4 cont. • Expansion/Compression Work for a gas under external pressure P ext is equal to - P ext dV • First law: integral form ∆ U = w + q, differential form dU = δ q + δ w • When do we use dX vs δ X ? • When do we and don’t we use the symbol ∆ ? • Free expansion, expansion under constant external pressure, reversible expansion (P ext = P) • Quasistatic (Slow) vs Irreversible (Fast) Expansion/Comp....
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