Recently the Union government restricted the use of liquid oxygen for non-medical purposes with immediate effect

LEARNING FROM HOME/ WITHOUT CLASSES/ BASICS

Air is defined as a mixture of several gases. The air which is used for breathing primarily contains oxygen (21%) and nitrogen (78%). Other gases, including helium, neon, hydrogen, carbon dioxide, and argon, make up the remainder. All these gases are dissolvable and are carried in the blood.

Oxygen (O), non-metallic chemical  is a colourless, odourless, tasteless gas essential to living organisms, being taken up by animals, which convert it to carbon dioxide; plants, in turn, utilize carbon dioxide as a source of carbon and return the oxygen to the atmosphere.

Pure oxygen is 1.1 times heavier than air. Oxygen has two allotropic forms, diatomic (O₂) and triatomic (O₃, ozone). 

Medical oxygen is high purity oxygen that is used for medical treatments and is developed for use in the human body. Liquid oxygen is pale blue and extremely cold. Liquid oxygen is a cryogenic liquid.

            Cryogenic liquids are liquefied gases that have a normal boiling point below -238°F (-150°C).

Liquid oxygen has a boiling point of -297.3°F (-183.0°C). Because the temperature difference between the product and the surrounding environment is substantial—even in the winter—keeping liquid oxygen insulated from the surrounding heat is essential. The product also requires special equipment for handling and storage. Oxygen is often stored as a liquid, although it is used primarily as a gas. Liquid storage is less bulky and less costly than the equivalent capacity of high-pressure gaseous storage.

A typical storage system consists of a cryogenic storage tank, one or more vaporizers, a pressure control system, and all piping necessary for the fill, vaporization, and supply functions. 

Concentrated oxygen is oxygen in gas form, whereas liquid oxygen is oxygen that has been compressed into liquid form. That’s the major difference between the two.

Concentrated oxygen tanks are much larger than liquid oxygen tanks. To convert oxygen from gas to liquid, it must be cooled by at least -297 degrees Fahrenheit, or -183 degrees centigrade. Below −183 C (−297 °F), oxygen is a pale blue liquid; it becomes solid at about −218 °C (−361 °F).