> hydrogen is chemically inert enough In addition to just keeping it stored (as others have mentioned), hydrogen can have huge structural effects. It doesn't m

> hydrogen is chemically inert enough In addition to just keeping it stored (as others have mentioned), hydrogen can have huge structural effects. It doesn't matter if it's chemically inert if it ends up diffusing through your metal and forming voids and the like: http://en.wikipedia.org/wiki/Hydrogen_embrittlement http://en.wikipedia.org/wiki/Hydrogen_embrittlement