Hydrogen atoms are very small and hard to contain. The atoms tend to diffuse into the structure of whatever is containing them and can cause blistering or embri

Hydrogen atoms are very small and hard to contain. The atoms tend to diffuse into the structure of whatever is containing them and can cause blistering or embrittlement - https://en.wikipedia.org/wiki/Hydrogen_embrittlement https://en.wikipedia.org/wiki/Hydrogen_embrittlement