IUPAC - dimensionless Henry’s law volatility constant (09019)

dimensionless Henry’s law volatility constant

defined via amount concentrations
symbol:

H_{v}^{c c}

synonym: dimensionless Henry volatility

https://doi.org/10.1351/goldbook.09019

Amount concentration

c_{g}

of a species in the gas phase divided by the amount concentration

c_{g}

of that species in the liquid phase under equilibrium conditions at infinite dilution:

H_{v}^{c c} := \underset{c_{l} \to 0}{l i m} \frac{c_{g}}{c_{l}}

Note:
Instead of the amount concentrations

c_{g}

and

c_{l}

, the mass concentrations

γ_{g}

and

γ_{l}

can be used here. This yields the same dimensionless Henry volatility because the molar mass

M

of the solute cancels out:

γ_{g} / γ_{l} = (c_{g} M) / (c_{l} M) = c_{g} / c_{l}

Example:
The dimensionless Henry volatility of ozone in water at

T = 298.15 K

H_{v}^{c c} (O_{3}) = 4.0

See: Henry’s law volatility constant

Source:
PAC, 2022, 94, 71. (Henry’s law constants (IUPAC Recommendations 2021)) on page 74 [Terms] [Paper]

Citation: 'dimensionless Henry’s law volatility constant' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.09019 RIS BibTex EndNote

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dimensionless Henry’s law volatility constant