Exp. 01
Pressure & volume
Boyle's Law
P₁V₁ = P₂V₂
How Boyle's Law governs lung compression, equalization, blood shift, freefall, and ascent in freediving.
Open moduleResearch notes · Breath-hold physiology
The physics of descending on a single breath
Gas laws and physiology made tangible — measure how pressure, partial pressures, dissolved nitrogen, and O₂ unloading change from the surface to 60 meters.
P₁V₁ = P₂V₂ · P_total = Σ P_i · C = k · P_N₂ · Bohr
Boyle's lawDalton's lawHenry's lawBohr effectLive simulator
Fig. 01
Pressure vs. depth
P = 1 + d/10
Boyle · volume ↓Dalton · PP ↑Henry · dissolve ↑
Module I
Core physical laws
Four modules — each topic with its own interactive visualization and freediving application.
Exp. 02
Coming soonPartial pressures
Dalton's Law
P_total = P_N₂ + P_O₂ + …
How O₂ and N₂ partial pressures rise with depth, drive narcosis, and fall on ascent — including shallow-water blackout.
Coming soonExp. 03
Coming soonGas dissolution
Henry's Law
C = k · P_N₂
How partial pressure drives nitrogen into tissues over time — loading at depth, off-gassing on ascent, and when it matters on breath-hold.
Coming soonExp. 04
Coming soonCO₂, pH & O₂ unloading
The Bohr Effect
↑ CO₂ · ↓ pH → O₂ unloads
Higher CO₂ and lower pH weaken hemoglobin's grip on oxygen — so tissues can use it. Hyperventilation does the opposite and raises blackout risk.
Coming soonModule II · Interactive
Descent simulator
A live instrument panel — adjust depth and read pressure, lung volume, partial pressures, and nitrogen saturation.
Fig. 02 · Interactive
Descent simulator
Live0–60 m
10m
20m
30m
40m
50m
60m
V 100%
Dive view
Depth control
0m
Pressure
1.00bar
Readings at 0 m
Ambient pressure1.00 bar
+1 bar per 10 m
Lung volume · Boyle100%
Of surface volume
N₂ partial · Dalton0.79 bar
79% of ambient
O₂ partial · Dalton0.21 bar
21% of ambient
Dissolved N₂ · Henry1%
Relative to 60 m · ~5 min at depth