Coronavirus second wave: How oxygen for medical use is extracted

There has been a lot of conversation lately around liquid oxygen, medical oxygen, oxygen concentrators and so on. The govt has explained what each of these is and the methods to extract oxygen

Shortage of oxygen during the second Covid wave has caused the number of deaths to rise in the country. Shortness of breath is a symptom of Covid-19 and may require the patient to be put on oxygen support. In the last few weeks, there has been a lot of conversation around liquid oxygen, medical oxygen, oxygen concentrators and so on. The government has, in a statement, tried to explain what each of these is and the methods used to extract oxygen.
 
Why liquid oxygen?
Due to its low melting and boiling points, oxygen is in a gaseous state at