![]() ![]() The current amount of pressure is equal to 1 atm (atmospheric pressure) + 1 atm for every 10 m or 33 ft of water above you.ģ3 Liters per Minute/ 1 atm + 2 atm = 11 Liter per Minuteġ.33 Cubic Ft per Minute / 1 atm + 2 atm = 0.44 Cubic Ft per Minuteįeet can become tricky to convert in atm, so I would recommend converting them into meters (feet / 3.2808 = meters) and dividing the result by 10.Įx: 75 feet / 3.2808 = 22.8 m => 22.86 m / 10 = 2. To take it out of the equation and have a number that can be compared for every depth, we need to divide our number by the amount of pressure (in atm) equivalent to our depth. Once we know how much air we used, we need to bring that divide this number by the duration of the dive to have a consumption per minute.ġ 000 Liters / 30 minutes = 33 Liters/MinuteĤ0 Cubic Ft / 30 Minutes = 1.33 Cubic Ft / Minuteīut as we saw above, these numbers are dependent on the depth of the dive. The best way is to multiply the total capacity (80 Cubic Ft) by the ratio between starting pressure and end pressure.Ĩ0 Cubic Ft * (1450 PSI/2900 PSI) = 40 Cubic Ft ![]() With imperial units, we can use the same calculation because of the way Cubic Ft is used. To find how many air litres are packed in 10 Liters tank inflated at 100 Bars, we need to multiply the number of Bars by the tank size in Liters. The first step will be to understand how much air you used during the dive in your desired unit. Size of the tank = 10 Liters (80 Cubic Ft).End of Dive Pressure = 100 Bars (1450 PSI).Relax, note your tanks pressure and sit quietly for 10 minutes. To find your RMV, descend to a comfortable depth. This is more useful than other methods because you can use it with any size tank. Starting Pressure in the Tank = 200 Bars (2900 PSI) A useful method of calculating your personal air consumption rate involves finding your Respiratory Minute Volume (RMV).To illustrate, we will use the following example numbers: ![]() With this number in mind, you can then understand your current level and reverse how much air you should need for a particular dive, which is a necessary safety planning dimension for deep dives or cave diving. These extra air molecules are packed into the same breath you would take at the surface, but you are actually breathing x times more of them the deeper you go.īecause of this, it can become tricky to understand how efficient you are with your air reserves, and that’s where the Surface Air Consumption Rate (SAC) comes into play.īy taking the depth of your dive out of the equation, the SAC allows you to build a baseline idea of how much air you are consuming. When breathing air under higher pressure, you breathe more air molecules for the same volume. You might have noticed that the more divers are experienced, the more they can extend their air reserves for a longer time.īut air consumption depends greatly on the depth at which you are diving. When it comes to evaluating your skills and plan your dives safely, understanding how much air you are using is fundamental. ![]()
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