Henry's Law Constants

A compilation of 17350 values of Henry's law constants for 4632 species, collected from 689 references is available here:

R. Sander
Compilation of Henry's law constants (version 4.0) for water as solvent
Atmos. Chem. Phys., 15, 4399-4981, 2015

The pdf of the article can be downloaded directly from the web page of the open-access journal. If you would like to order a printed copy, please contact the Copernicus publisher at production@copernicus.org.

Older (obsolete) versions of the compilation are also still available:

If you find errors in the list or if you know of additional references that I could include, please send me an email at rolf.sander@mpic.de. Especially when you have published measurements of Henry's law's constants, I would appreciate it very much if you send me a reprint! If you have any other comments or questions, please read the FAQ first!!!

Frequently asked questions (FAQ)

What kind of data is included in the list?

The list contains Henry's law constants for several organic and inorganic species in water. The Henry's law constant is defined here as the ratio of the aqueous-phase concentration of a chemical to its equilibrium partial pressure in the gas phase.

What kind of data is NOT included in the list?

Henry's law refers to small concentrations (lim c-->0). Maximum solubilities are not included. Solubility products, i.e. products of ion concentrations are not included either.

Henry's law constants for solvents other than water are not included.

Values obtained under high pressures (p >> 1000 hPa) and temperatures (T > 373 K) are not included.

Why are CO and CO2 apparently not included?

You cannot find them in the inorganic section. CO and CO2 are included in the miscellaneous organics subsection (all species containing carbon atoms are in the organic section).

Can you help me? I've got a question!

You're welcome to send me an email but please don't be too disappointed in case I don't have the time to answer it. Collecting Henry's law constants is not my main job. It's just something I did because I needed (and still need) them for my research. I have received much more email than I expected and I won't be able to answer all questions individually. Before sending me an email, please consider the following points:

Converting between different definitions and units for Henry's law constants can be quite tricky. I'm afraid I won't have the time to answer individual questions on how to convert from unit xxx to unit yyy.

Henry's law constants are used in several research areas, e.g. pesticide control, waste water management, and atmospheric chemistry. Since I'm an atmospheric chemist myself, I don't think I will be able to help you with problems in the other research areas.

Pressure or fugacity?

The official IUPAC definition of Henry's law constants uses fugacity to describe the gas-phase composition. In my compilation, I use pressure. In other words, I am assuming a fugacity coefficient of 1. This simplification is justified in environmental science where pressure is around 1 atmosphere. As mentioned above, values obtained under high pressures are not included in my list.


Well, I knew it would happen... A big list like this just couldn't be perfect. I have now added a list of errors that I have made in my compilation.

Errata for version 4.0

If you notice that any Henry's law data (e.g., from your work) are missing or incorrectly listed, please send an email to rolf.sander@mpic.de.

Errata for version 3.99

Errata for version 3

Rolf Sander This document was last changed 01 Sep 2015