The a and b parameter Bühlmann originally used in his models can be derived: The Bühlmann ZH-L12 model (1983) for Nitrogen Next sections present for various models the M-values. The maximum allowed (absolute) partial pressure M of the Nitrogen in a hypothetical tissue compartment, characterized by half-time τ, is defined as: M Partial pressure limit, for each tissue compartment (half-time) M 0 The partial pressure limit at sea-level (zero depth) (msw) ΔM Increase of M per meter depth (msw/m) d Depth (m) M-values in bar can be derived by deviding the M-value in msw by 10. The pressure in this section, however, are presented in msw (meter sea water) to be consistent with literature. As a diver we like to use bar’s as pressure unit, since we are familiar with the bar.
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