Uses of oxygen gas are as follows:

1. Inside the body, oxygen gas helps to produce energy reacting with glucose.
2. Oxygen is used for cutting or welding metals. This work is done by oxy-acetylene flame or hydrogen flame.
3. oxygen gas cylinder is used by mountaineers at high altitude. like climbing Mount Everest. and space.
4. Oxygen is needed for surgical patients in the hospital.
5. It is used to manufacture a wide range of chemicals including nitric acid and hydrogen peroxide.
6.  It is used to make epoxyethane (ethylene oxide), used as an antifreeze and to make polyester, and chloroethene, the precursor to PVC.
7. It is used to make metals, such as copper, lead, and zinc.
8.  oxygen is used to enrich the air feed to catalytic cracking regenerators.
9.  oxygen is used in coal gasification that can be used as a chemical feedstock or precursor for more easily- transported and easily-used fuels.