How to produce oxygen?

Question

how does a simple machine that produce oxygen work?

Answer 1

Some chemical reactions can help in producing oxygen and some machines can help in increasing the concentration of oxygen and as such increasing its level but the best and most simple method is (If we talk about whole world) plant more trees, save forests and pollute less. That will make all the diffrence.

Answer 2

I use to manage an oxygen homecare center.  And we would provide our patients with a home machine called a concentrator.  This is a device that raises the oxygen concentration level from around 21% to well in to mid and upper 90% - it is not so much "produced" as you mentioned in the question, but it is more of a seperating out the 80% of nitrogen in atmospheric air.  Here goes the technical to how an oxygen concentrator.

Atmospheric air consists of approximately 80% nitrogen and 20% oxygen. An oxygen concentrator uses ambient air as a source of oxygen by separating these two components. It utilizes the property of zeolite granules to selectively absorb nitrogen from compressed air.  Atmospheric air is entrained by the concentrator, filtered and raised to a pressure of 20 pounds per square.  

The compressed air is then introduced into one of the canisters containing zeolite granules where nitrogen is selectively absorbed leaving the residual oxygen available for a medical patient. After about 20 seconds, the supply of compressed air is automatically diverted to the second canister where the process is repeated, enabling the output of oxygen to continue uninterrupted. While the pressure in the second canister is at 20 P.S.I., the pressure in the first canister is reduced to zero. This allows nitrogen to be released from the zeolite and returned into the atmosphere. The zeolite is then regenerated and ready for the next cycle. By alternating the pressure in the two canisters so that first one and then the other is at 20 P.S.I., a constant supply of oxygen is produced as the zeolite is continually being regenerated. Individual units have an output of up to five liters per minute (5LPM) with an oxygen concentration of up to 95%.

Hope this helps.