How do the compressible pipe flow formulas behave forsmall pressure drops? Let air at 20°C enter a tube of diameter1 cm and length 3 m. If f = 0.028 with p1 = 102 kPaand p2 = 100 kPa, estimate the mass flow in kg/h for(a) isothermal flow, (b) adiabatic flow, and (c) incompressibleflow  at the entrance density.

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