Definition - What does Critical Value mean?
A critical value is a scientifically determined figure used to evaluate the impact of strain energy or a chemical's concentration impact on a given surface after being exposed to an external force. It is the point at which a metal is no longer recoverable to its original state.
Corrosionpedia explains Critical Value
When a metal is exposed to an external physical force, strain energy is applied to the metal. If the strain energy is greater that the critical value, the original physical form of the metal is no longer recoverable. If the strain energy is less than the critical value, the original metal form can still be recovered.
Critical value measurements and comparisons can also be applied to metals that have been exposed to external chemical reactions or substances in a corresponding manner.