I keep getting this question wrong, and I am struggling to understand why this is. 1. The problem statement, all variables and given/known data 2. Relevant equations F = p*A Ap = π*r2 3. The attempt at a solution Denoting patm as atmospheric force, and p0 as pressure inside the cylinder. Firstly, a force balance on the system. Force UP = Force DOWN. p0*Ap = m*g + patm*Ap patm = 101.4 kPa , and at 104.4°C p0 is equal to a pressure between 110 kPa (at 102.3°C) and 120 kPa (at 104.8°C). By interpolation p0 is equal to 118.4 kPa. Rearranging the force balance, m = ((p0-patm)*Ap)/g = ((118.4-101.4)*(π*(0.042)2)/9.81 = 0.00960 kg. This seems like a VERY unrealistic situation considering this very small mass is creating 17 kN/m2 of force.. Any help would be appreciated.