1. The problem statement, all variables and given/known data 20 m3 of gas at a pressure of 25 bar is to be stored in a cylindrical pressure vessel 2 m long. Given the following information : The yield strength of the vessel material is 14,000 psi If a factor of safety of 5 is to be used, determine: Whether the vessel should be treated as a thin or thick cylinder. 2. Relevant equations iv been given the feed back as follows: For this question you need to apply the thin cylinder theory to determine the thickness t, then depending on the answer for r/t, determine whether the cylinder should be treated as a thick cylinder. If it is a thick cylinder, then the thick cylinder theory must be applied to determine the thickness of vessel required. The attempt at a solution 3.1 bar = 100,000 Pa factor 5 means that maximumstrength yield strength =1 /5 1 psi=6894.7N /m2 a) We have PV = RT = PSL (L= 2 m long.) So the strength of our vessel should be 25⋅105 Pa≈362.6 psi From the factor of safety we can find the the maximum strength should be 14/5⋅103 psi=2.8⋅103 psi So, the vessel should be treated as a thick. im told that my attempt is incorrect but i dont know how else to solve it useing the feed back im given.