palv | alveolar N2 pressure
…
…
… bar
What the lungs are pushing into the blood at target depth.
pt,0 | tissue pressure at t=0
…
…
… bar
Where this compartment started, assumed equilibrated at start depth.
k | rate constant
= ln(2) / t1/2
…
… min⁻¹
Faster compartments → bigger k → catch up sooner.
e−kt | "fraction left to go"
= e−k · t
…
…
1.0 at t=0, decays toward 0. Half-gone every t1/2.