Question

if the gauge pressure at the bottom of a hydrotherapy tank is 11 psi what is the absolute pressure?

Answer 1

The gauge pressure is equal to the absolute pressure minus the atmospheric pressure. We know that the atmospheric pressure is 14.7 psi, then we have:

$\begin{gathered} 11=absolute\text{ pressure-14.7} \\ absolute\text{ pressure=11+14.7} \\ absolute\text{ pressure=25.7} \end{gathered}$

Therefore, the absolute pressure is 25.7 psi.