The water pressure at the base of the water tower shown in the figure is $2\mathrm{.}9$ bar. The water level is L $=20$ m above the tower base. The density of the water is $103$ kg$/$m$3$ and g $=9\mathrm{.}81$ m$/$s$2.$  Determine the pressure of the air trapped above the water level, in bar and in lbf$/$in$2.$

 

g=9.81 m/s Pwater = 10 kg/m3 Water- P Air L