Effects of Changes in Pressure and Oxygen Levels for Human Health
Oxygen present in normal air and is very important for livelihoods and burning. Humans can breathe and work well if the air contains about 21% oxygen. In air containing 17 % oxygen, humans will breathe deeper and faster. Symptoms or due to decreased oxygen levels at 15 % is feeling uncertain, sometimes ears feel like ringing, dizziness and palpitations. The symptoms are more felt heavy with decreasing oxygen levels up to 10 %. In general, humans not to fall unconscious to the oxygen content of 13%. Symptoms or negative effects will be more severe if the oxygen level drops to 7%. Oxygen levels below 6 % , humans will experience very breathless and in a few minutes can dismiss heart rate. 6 % oxygen percentage is called the fatal point for oxygen. At a concentration of 20 % or 21 % no negative effects on humans, even pure oxygen did not show significant symptoms, provided that the pressure does not exceed the specified. For example, the " self-contained oxygen breathing apparatus ...