1, different physical properties: liquid oxygen is liquid, oxygen is gaseous.
2, the boiling point is different: liquid oxygen at room temperature and pressure does not exist, oxygen in our lives, although invisible, but can be used every day.
3, in the air when the concentration of oxygen reaches a certain proportion can promote combustion (combustion) and can not be spontaneous combustion. Liquid oxygen and organic matter and easy to oxidize.
4, oxygen can refer to the element oxygen, liquid oxygen refers to liquid oxygen.