For the Air$-0$il$-$Water system at $20$ degC at right, find a$)$ the specific weight of the air at the top b$)$ the specific wt of the oil in lb$/$ft$3$

and c$)$ the absolute reading of gage C at the bottom of the water portion in psia. All pressure gages are measuring absolute pressure.

Gage A reads $25$ psia and gage B reads $2\mathrm{.}5$ psia less than gage C$.$ The Oil is not the same oil from table $2\mathrm{.}1.$ Warning: you cannot use

table $2\mathrm{.}1$ for gamma air because it's compressed.