If you want to open a .oar file on your computer, you just need to have the appropriate program installed. To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.
Biological Oxygen Demand (BOD) is a measure of the oxygen used by microorganisms to decompose this waste. If there is a large quantity of organic waste in the water supply, there will also be a lot of bacteria present working to decompose this waste. In this case, the demand for oxygen will be high (due to all the bacteria) so the BOD level will be high. As the waste is consumed or dispersed through the water, BOD levels will begin to decline. Nitrates and phosphates in a body of water can contribute to high BOD levels.
The information below will assist you in determining when to order more oxygen. The most frequently used portable oxygen cylinder is the E tank. When full, it contains enough oxygen to supply a person using a flow rate of 2 liters per minute for about 5 hours. Please refer to the tank duration chart to determine how long your tank will last based on the liter flow prescribed by your physician. With this information, your pressure gauge reading will enable you to estimate your supply of oxygen. A full cylinder registers approximately 2000 psi of compressed gas.