Practice question

**Zeroth law of thermodynamics** if two systems A and B each in thermal equilibrium with third C, then A and B in equilibrium with each other, defines temperature as property that is same for systems in thermal equilibrium, basis for thermometer, temperature scale, thermal equilibrium means no net heat flow, same temperature. Δ Q = m s Δ T . m = 0.5 , s = 900 , Δ T = 55 - 25 = 30 . Δ Q = 0.5 × 900 × 30 = 13500 J . Using first law ΔU = Q - W, W = ∫ P dV, isobaric W =