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Mask Leak Rate:
Mask Pressure:
cmH20:
The rate in which a users mask leaks air while they sleep ( measured in Liters of air per Second or L/s)
The pressure in which a users CPAP machine outputs pressure to their mask (measured in cmH20)
A measurement of pressure known as "centimeter or water". It may be defined as the pressure exerted by a column of water of 1 cm in height at 4 °C (temperature of maximum density) at the standard acceleration of gravity.
I.E. so that 1 cmH2O (4°C) = 999.9720 kg/m3 × 9.80665 m/s2 / 100= 98.0638 Pa, but conventionally a nominal maximum water density of 1000 kg/m³ is used, giving 98.0665 Pa.
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