Before revision: For example, for nitrogen: N2 ( gas) 2 N (dissolved ) For the above reaction, the equilibrium constant, K, is: Where: C is the concentration p is the partial pressure Therefore
After revision: For example, for nitrogen: N2 ( gas) 2 N (dissolved ) For the above reaction, the equilibrium constant, K, is: Where: c_{at is the concentration of the dissolved atoms into the metal (in the case above atomic nitrogen N) p_{molmolecularatomsof the gas at the interface with the metal (in the case above, the molecular nitrogen N2) is the partial pressure Therefore