FAQ-L.5: What does the leakage rate unit mbar l/s mean and how can it be converted into other units?

If, in a volume of 1 liter, the gas pressure drops by 1 mbar within 1 s, this corresponds to a leakage rate (outflow of gas) of 1 mbar l/s. The unit mbar l/s is relatively difficult to imagine, but is typically used alongside units such as Pa m m³/s, Torr l/s or atm cc/s in the vacuum applications.

The indication becomes more understandable if the loss quantity is indicated in other units. For example, units such as g/a or oz/y are used in air conditioning technology. For the indication of leakage losses in compressed air systems, the unit l/min has prevailed.

Examples of unit conversion (at Δp = 1,013.25 mbar, 273.15K or 0°C, medium air):

  • 10⁰ mbar l/s ≙ 1 mbar l/s
                        ≙ 10⁻¹ Pa m³/s
                        ≙ 1 cm³/s (≙ 1 cm³ of air flows through a leak in 1 second)
  • 10⁻² mbar l/s ≙ 0,01 mbar l/s
                         ≙ 10⁻³ Pa m³/s
                         ≙ 6*10⁻¹ ml/min ≙ 6*10⁻⁴ l/min
                         ≙ 4,3*10⁻⁵ kg/h ≙ 3,75*10⁺² g/a

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