For liquid water the isothermal compressibility is given by: κ = c / V(P + b) where c and b are functions of temperature only. If 1 kg of water is compressed isothermally and reversibly from 1 to 500 bar at 60°C, how much work is required? At 60°C, b = 2700 bar and c = 0.125 cm³·g⁻¹.