IUPAC - Henry’s law volatility constant (via p and x) (09027)

Henry’s law volatility constant (via p and x)

symbol:

H_{v}^{p x}

, unit:

Pa

synonym: Henry volatility (defined via partial pressure and liquid-phase amount fraction)

https://doi.org/10.1351/goldbook.09027

Partial pressure

p

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

x

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

H_{v}^{p x} := \underset{x \to 0}{l i m} \frac{p}{x}

Note:
The coherent SI unit for

H_{v}^{p x}

Pa

Example:
The Henry volatility (defined via partial pressure and liquid-phase amount fraction) of ozone in water at

T = 298.15 K

H_{v}^{p x} (O_{3}) = 5.5 \times 10^{8} Pa

See also: Henry’s law volatility constant

Source:
PAC, 2022, 94, 71. (Henry’s law constants (IUPAC Recommendations 2021)) on page 76 [Terms] [Paper]

Citation: 'Henry’s law volatility constant (via p and x)' 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.09027 RIS BibTex EndNote

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Henry’s law volatility constant (via p and x)