1. The problem statement, all variables and given/known data A 4 cubic meter rigid vessel contains 0.04 cubic meters of liquid water and 3.96 cubic meters of water vapor at 101.325 kPa. What is the quality of the saturated vapor? 2. Relevant equations Specific volume of saturated liquid at 100 C and 101.325 kPa: 0.001044 m^3/kg Specific volume of saturated vapor at 100 C and 101.325 kPa: 1.67290 m^/kg Mass of Vapor = (Volume vapor) / (Specific Volume of sat. vapor) Mass of water = (Volume water) / (Specific Volume of sat. liquid) x = (Mass of Vapor) / (Total Mass) 3. The attempt at a solution Mass of liquid: 0.04/0.001044 = 38.314 kg Mass of vapor: 3.96/1.67290 = 2.367 kg x = 2.367/(38.314+2.367) = 0.05818 Also, for some reason, I thought the quality could be found by specific volumes, which would give me: x = (1.5313-0.001044)/(1.6729) = 0.9147 Could anyone tell me which method is correct? We have used specific volume to find the quality a few times, which confuses me as to why this would be different.