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Article | REF: M4275 V1

Gases other than hydrogen in iron and steel

Authors: Pierre PERROT, Jacques FOCT

Publication date: March 10, 2003

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2. Solubility of gases in pure iron

2.1 Henry's Law

In 1803, English physician and chemist William Henry demonstrated experimentally that the solubility of a gas in a solvent is proportional to its pressure. This law must be treated with caution, as it is based on three assumptions:

  • the gas is perfect;

  • the gas-metal solution is ideal;

  • the molecularity of the solute in both dissolved and gaseous phases is the same.

Henry's Law assumes that dissolution is based on the mechanism:

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Solubility of gases in pure iron
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