24. What is the degree of freedom for a system comprising liquid water equilibrium with its vapour?

26. A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the __________ mean of P

_{1}and P_{2}. (where, P_{1}and P_{2}are initial and final pressures respectively)Page **4** of **75**