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
Gas solubility in steels
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