oxygen

Oxygen is extremely active chemically, forming compounds with almost all of the elements except the inert gases. Oxygen unites directly with a number of other elements to form oxides. It is a constituent of many acids and of hydroxides, carbohydrates, proteins, fats and oils, alcohols, cellulose, and numerous other compounds such as the carbonates, chlorates, nitrates, phosphates and sulphites. Portable oxygen choices relate to portable oxygen concentrators, liquid oxygen, or compressed gas cylinders. Portable oxygen concentrators need a battery or to be plugged in. They are poised to become the system of choice as fuel cell power becomes more available. The worldwide liquid oxygen forecast, which was at $81.3 million in the year 2001, is expected to make a large increase to $147.9 million by the year 2007. The worldwide portable oxygen concentrator market, which was at $300 thousand in the year 2001, is expected to make a large increase to $112.6 million by the year 2007.