What are the uses of oxygen?

Question

Uses of oxygen

Answer 1

Nitrogen

Answer 2

 It is used to make fire extinguishers 

Answer 3

Used in breathing 

Answer 4

Used in combustion 

Answer 5

Oxygen mixed with other  gas are used in welding 

Answer 6

Used in breathing

Answer 7

Used as rocket fuel
Used in hospitals by patients with breathing difficulties
Used in the extraction of iron from its ore

Answer 8

Used in hospital for breathing 
Used in support burning
Used  as  breathing gas

Answer 9

It is used in welding with acetylene gas

Answer 10

It is used by patient who have difficulty in breathing