Isnt hydrogen very explosive?
An explosion cannot occur in a tank or any contained location that contains only hydrogen. An oxidizer, such as oxygen must be present in a concentration of at least 10% pure oxygen or 41% air. Hydrogen can be explosive at concentrations of 18.359% and although the range is wide, it is important to remember that petrol can present a more dangerous potential than hydrogen since the potential for explosion occurs with petrol at much lower concentrations, 1.13.3%. Furthermore, there is very little likelihood that hydrogen will explode in open air, due to its tendency to rise quickly. This is the opposite of what we find for heavier gases such as propane or petrol fumes, which hover near the ground, creating a greater danger for explosion.
