Henry’s Law
Definition
The relationship stating that at a fixed temperature the concentration of a dissolved gas is proportional to its partial pressure above the solution, C = kH x P.
Introduced in Chapter 3 and reused here, it explains why higher CO2 pressure drives more gas into solution and why lower pressure or warming lets dissolved CO2 escape. In open air, raising CO2 pressure pushes the carbonate equilibrium toward the acid side, lowering pH and keeping carbonate scarce. It sets the boundary condition that links atmospheric CO2 to the entire carbonate system.
Related concepts
Oxygen solubility versus temperature · Deaeration · Carbonation (Dissolution of CO2)
Part of The Blueprint of Water · 🔥 thermodynamics