Two horizontal pipelines are parallel, with one carrying salt water $left(ho=1.988 ight.$ slugs/ $left.mathrm{ft}^{3} ight)$ and the

Two horizontal pipelines are parallel, with one carrying salt water $\left(ho=1.988\right.$ slugs/ $\left.\mathrm{ft}^{3}\right)$ and the other carrying fresh water $\left(ho=1.937\right.$ slugs $\left./ \mathrm{ft}^{3}\right)$. An inverted manometer using linseed oil $\left(ho=1.828\right.$ slugs $/ \mathrm{ft}^{3}$ ) as the manometer fluid is connected between the two pipelines. The interface between the oil and the fresh water in the manometer is $38 \mathrm{in}$. above the centerline of the freshwater pipeline, and the oil/salt water interface in the manometer is $20 \mathrm{in}$. above the centerline of the salt water pipeline. If the manometer reading is $8 \mathrm{in}$., determine the difference in the pressures between the pipelines in (a) $\mathrm{Pa}$ and in (b) psi.