Vital to human life, oxygen is widely used in medical facilities to aid in patient care, for resuscitation and curing, and prevention of hypoxemia and hypoxia. Several other medical conditions require the use of medical oxygen to sustain life including cardiovascular and respiratory arrest, severe haemorrhage, shock and trauma, carbon monoxide poisoning and cyanosis. Medical oxygen is supplied in liquefied and gaseous form. When supplied in liquefied form it is administered by vaporizing the liquid to a gas at ambient temperature and delivered for inhalation through lungs. Life support gas is given to oxygen-deficient patients, artificially ventilated patients As part of the fresh gas supply in anesthesia or intensive care Used in clinical practice to provide a basis for most modern anesthetic techniques including pre and post-operative management