Name a metal that does not corrode in air. why?

Aluminum is the metal that does not corrode in the air.

Explanation:

Corosion is a natural process in which pure metals converted into oxides and reduce the life of metals.

Aluminum atom is a metal that belongs to react with the oxygen present in the air making aluminum oxides. These oxides attaches to the surface and does not allow another oxygen molecule entering it which prevent the process of corrosion.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.