Step 1

Air is purified by passing it through filters

Step2

Carbon (IV) Oxide gas is removed by passing the air through Concentrated Sodium Hydroxide solution

Step 3

The remaining air is condensed to about -25 degree centigrades to remove water vapour which solidifies out as ice

Step 4

The air is compressed to about 200atmospheres. The cooled compressed air is allowed to expand rapidly. This process is repeated until all the air liquefies

Step 5

The liquefied air is then passed into a the fractionating column containing compartments

Each compartment is slightly at a higher temperature than the one above it.The components of the liquid air then separates according to their boiling points

Nitrogen distils off first because it has a lower boiling point of -196 degrees centigrade followed by Argon at -186 degree centigrade and finally Oxygen at -183 degree centigrade.

Liquid Oxygen is transported in large insulated metal tanks.