What Happens If the level of oxygen in the Earth Overrated?

According to Wikipedia, the Earth's atmosphere consists of nitrogen (78.17%) and oxygen (20.97%), the rest is aragon, carbon dioxide, water vapor, and other gases.

You must be imagine how it feels when the supply of oxygen depleted or disappear completely, which would culminate in the death of living organisms at the destruction of the earth.
But have you ever thought what it would be if oxygen levels overrated? Curious? this is going to happen.

1. Oxygen Increases the Risk of Fire

Excessive oxygen levels are very dangerous, because hydrocarbons and other compounds that flammable, it would be inflammables and explosives if it gets oxygen very much.

In other words, if the oxygen concentration increases, the potential fire risk also increases.
For example, when you light up a cigarette while driving, of course coal will be much brighter and more quickly burn.

2. Oxygen Poisoning/Toxity

Oxygen, a gas which is a vital element for human life, it also can be toxic to humans. Oxygen can poison us (called oxygen poisoning), if the oxygen pressure higher than 1 bar (normal pressure) or if the oxygen levels is higher than 21%.

Excess oxygen conditions generally occur in people who use breathing apparatus with oxygen cylinders, such as deep-sea divers, confined space worker. Oxygen toxicity in humans bring bad effect on the three vital organs, like the lungs, nervous system, eyes, etc.

3. Increased Metabolism Process

Oxygen is essential for many metabolic processes in the body, oxygen is one of the compounds needed for the formation of energy for the human body. Usually we feel fresher and fitter when we indulge in nearby trees that shade. The amount of oxygen released by trees makes us healthier, especially if the oxygen we get very much. Oxygen is also good for athletes, with his many guns oxygen athlete tired easily. In addition to athletes, we can feel when we're exercising like joggging, so we do not get tired easily.

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