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A gas flows through a long pipe of constant diameter. The outlet of the pipe is...

A gas flows through a long pipe of constant diameter. The outlet of the pipe is higher than the inlet, and the pressure of the gas at the outlet is less than the inlet pressure. The gas temperature is constant throughout the pipe and the system is in steady state.

a) How do the mass flow rates at the inlet and outlet temperature compare? The densities? The volumetric flow rates (assume ideal gas)? What about the change in potential energy of the gas from inlet to outlet, is it positive, negative or zero? What about kinetic?

Any and all help is appreciated, I really don't get this at all.

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