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The MOD is significant when planning dives using gases such as Nitrox and Trimix because the proportion of oxygen in the mix determines the maximum safe depth for breathing that gas. There is a risk of Oxygen Toxicity if the MOD is exceeded. The tables below show MODs for a selection of oxygen mixes. Note that 21% is the normal air.


FORMULAS

To calculate the MOD for a specific ppO2 and percentage of oxygen, the following formulas are used:


In Feet

MOD (fsw) =\left ({ppO_2\over FO_2} imes 33 ight ) - 33 ight

In which ppO2 is the desired partial pressure in oxygen and the FO2 is the decimal value of the fraction of oxygen in the mixture. For example, if a gas contains 36% oxygen and the maximum ppO2 is 1.4 bar, the MOD (fsw) is ((1.4 / 0.36) x 33) - 33 = 95.4 feet.


In Metre s

MOD (m) =\left ({ppO_2\over FO_2} imes 10 ight ) - 10 ight

In which ppO2 is the desired partial pressure in oxygen and the FO2 is the decimal value of the fraction of oxygen in the mixture. For example, if a gas contains 36% oxygen and the maximum ppO2 is 1.4 bar, the MOD (m) is ((1.4 / 0.36) x 10) - 10 = 28.9 metres.


MOD TABLE IN FEET


These depths are rounded down to the nearest foot.


MOD TABLE IN METRES