The MK 25 UBA consumption rates are expressed in which unit?

• A. Liters per minute
• B. Gallons per hour
• C. Cubic meters per second
• D. Liters per second

Answer: (A)

Gas flow for the MK25 UBA is expressed in liters per minute because it reflects how much breathing gas the system uses each minute to support the diver’s respiration. Dive planning and gas-duration estimates are made on a per-minute basis, since breathing rates vary with effort but are most practically tracked over minutes. Expressing consumption in L/min lets you size tanks and plan dives using familiar breathing-rate ranges (for example, resting versus active rates) and convert easily to total gas on hand. Other units don’t fit typical dive planning: gallons per hour is too coarse for minute-by-minute planning, while per-second or cubic meters per second would imply unrealistically small or awkward values for human respiration. So, liters per minute is the standard way to express MK25 UBA consumption.