A student sucks on the end of a long tube which is initially filled with air and whose other end is in a large bucket of water which is open to the atmosphere. They manage to draw the water up a vertical distance of 3.36 m above the surface of the water in the bucket. What is the lowest pressure that the student's lungs can create?
[P(atmosphere)=105N/m^2, ρ(water)=1,000 kgm-3, g=9.81 m/s^2]
Hydrostatic pressure, P = Po +ρgh
The Attempt at a Solution
0 + (1000*9.81*3.36) = 33kN/m^2
This is my attempt at the problem. It's considered partially correct since this is the result of the water being sucked from the bottom of the bucket to the top, but it is not the actual pressure in the student's lungs.