Liquid Medical Oxygen is high purity oxygen used for medical treatment. It has been developed for use in the human body. Due to its low melting and boiling points, oxygen is in a gaseous state at room temperature.

There are various methods through which LMO can be produced. The most common production method is the separation of oxygen in Air Separation Units (ASUs).

ASUs are production plants that separate large volumes of gases. ASUs use a method known as the 'Fractional Distillation Method' to produce pure oxygen from atmospheric air.