Convert Concentrations or Partial Pressure of
O2, H2, N2O, H2S, or CO2

With the Unisense Unit Converter, you can convert concentrations of gases (μmol/L, %, ppm (vol/vol), ppm (mg/L)) and partial pressure (mm Hg, mBar) of five gases dissolved in water: Oxygen, hydrogen, nitrous oxide, hydrogen sulfide, and carbon dioxide.

You can adjust temperature, salinity, and pressure in relation to your application.

The calculations are based on the articles mentioned below.


Diffusivity and solubility of nitric oxide in water and saline
Zacharia, Ian G et al. (2005), Annals of Biomedical Engineering, vol. 33, 214-222
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The chemistry of the hydrogen sulfide and iron sulfide systems in natural waters
Morse, John W. et al. (1987), Earth Science Reviews, vol. 24, 1-42
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The solubility of nitrogen, oxygen and argon in water and seawater
Weiss, R. F. (1970), Deep-Sea Research and Oceanographic Abstracts, vol. 17, 721-735
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Solubility Data Series
KERTES, A.S. et al. (1981), Oxygen and Ozone, vol. 8, vi
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Solubility of hydrogen in water, seawater, and NaCl solutions

Crozier T.E. & Yamamoto S. (1974), Journal of Chemical and Engineering Data 19: 242-244