1. The problem statement, all variables and given/known data What is the headspace pressure (air)? Closed tank part filled with fluid under pressure, there are tubes that indicate the fluid level and pressure. The tube on the left is open to atmosphere. fluid s.g. 1.2 x = 5m y= 1.7m 2. Relevant equations See below 3. The attempt at a solution Assuming atmospheric pressure and rho*g*h come into play?