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Kerrie Kerrie
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9 years ago
 Slight Smile As Soon As Possible
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wrote...
9 years ago
Ah! Oxygen - the gas of life! Without it for a few seconds and the world disappears from view. Too much of it can be a bad thing as well.

Visiting a person receiving common oxygen therapy in a hospital refutes the notion that the oxygen is pure. A heart attack victim may be breathing oxygen through a nasal cannular. Air is also entering the nose at the same time the oxygen is. Even "oxygen tents" were not totally closed. Breathing pure oxygen over a period of time may lead to serious lung irritation and even pneumonia. Breathing pure oxygen at pressures greater than 1 atmosphere can lead to fatal consequences.
wrote...
9 years ago
In underwater diving activities such as saturation diving, technical diving and nitrox diving, the maximum operating depth (MOD) of a breathing gas is the depth below which the partial pressure of oxygen (ppO2) of the gas mix exceeds a safe limit. This safe limit is somewhat arbitrary, and varies depending on the diver training agency or Code of Practice, the level of underwater exertion planned and the planned duration of the dive, but is normally in the range of 1.2 to 1.6 bar.

The MOD is significant when planning dives using gases such as heliox, nitrox and trimix because the proportion of oxygen in the mix determines a maximum safe depth for breathing that gas. There is a risk of acute oxygen toxicity if the MOD is exceeded. The tables below show MODs for a selection of oxygen mixes. Note that 21% is the concentration of oxygen in normal air.
Source  http://en.wikipedia.org/wiki/Maximum_operating_depth
When you like a flower, you just pluck it out.
But when you love a flower, you water it daily.
The one who understands this, understands life.

- That's the difference between I like you and I love you.
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