The helium-filled blimp shown in Fig. P1.52 is used at various athletic events. Determine the number of pounds of helium within it if its volume is \(68,000 \mathrm{ft}^{3}\) and the temperature and pressure are \(80^{\circ} \mathrm{F}\) and \(14.2 \mathrm{psia}\), respectively.

Fig. P1.52