Industrial gases such as oxygen and nitrogen are
manufactured by an air separation plant.
First, air that has had moisture (H2O) and carbon
dioxide (CO2) is removed and separated to
manufacture nitrogen (N2), argon (Ar) and
Oxygen (O2). The separation process is based
upon differences in boiling points of each of the
constituent gases. Similarly, air separation plants
manufacture other rare or inert gases such as
Hydrogen (H2) and Helium (He).