Make a Pv $($pressure$-$specific volume$)$ sketch for air showing $2$ isotherms, namely $70$ F and

T$2$ from Problem $2.$ The plot does not have to be to scale with actual $P$ and $v$ increments.

Next, sketch the isentropic compression process starting at the inlet $($ point $1)$ at $14\mathrm{.}7$ psia

and $13\mathrm{.}3ft\frac{3}{l}bm($prove this value is the inverse of the inlet density$)$ and then ending up at

the exit pressure of $160$ psia and T $2$ isotherm $($ point $2).$ In addition to the sketching, also

calculate the specific volume at the exit knowing P and T$.$ Hint: you can use proportions or

the ideal gas equation directly$-$take your pick. $($ans: $3\mathrm{.}9ft\frac{3}{l}bm)$