Air flows steadily through a short duct of gradually changing area, and smooth inside surface. The air flow is supplied by a large tank, wherein the temperature and pressure are held constant at 450 deg F and 30 psia. At a certain location, the flow area is equal to 2.0 in2, and the density is equal to 0.020 lbm/ft3. Calculate pressure

Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.