so I have been working on this problem : 1. Diameter1 at wide end: 8cm || V1 = 1.56m/s 2. Diameter2 at narrow end: 3cm || V2 = 11.094m/s ***Find the manometer reading*** : https://i.stack.imgur.com/ZKpT0.jpg I know that due to Bernoulli's Equation the pressure where velocity is at 11.094m/s is much lower than at the other end. This can also be seen from the Mercury(Hg) level. **I have take P2 as being 0 because it is open to the atmosphere -- I am unsure whether this should be taken as 0 or 1.** I have used the following equation to work out P1 : P1+(1/2 ρv1^2)=P2+(1/2 ρv2^2) and I end up with P1 = 4.5581(atm??) I am still unsure how to proceed in this case. Any help or tips would be appreciated.