Ethylene enters a 1 in. schedule 80 pipe at $170^{\circ} \mathrm{F}$ and $100 \mathrm{psia}$ and a velocity of $10 \mathrm{ft} / \mathrm{s}$. At a point somewhere downstream, the temperature has dropped to $140^{\circ} \mathrm{F}$ and the pressure to 15 psia. Calculate the velocity at the downstream conditions and the Reynolds number at both the upstream and downstream conditions.