How significant are interfacial contributions to the work during an isotropic expansion process? Consider a system consisting of water in a cubic volume V = 1 L and at T =100 C and P = 1 atm. (a) If the water is entirely vapor, estimate the work done if the volume is increased isotropically and under isothermal conditions by 10%. (b) Instead let the water be 50% vapor and 50% liquid on a volume basis, such that an interface