Zeppelins were essentially giant gaseous hydrogen balloons. That is directly flammable.
AFAIK liquid hydrogen tanks are orders of magnitude safer (as in “a totally different problem”).
AFAIK liquid hydrogen tanks are orders of magnitude safer (as in “a totally different problem”).
- Liquid hydrogen is so cold that many metals weaken
- Exposure to hydrogen itself weakens many metals (hydrogen embrittlement)
- Liquid hydrogen expands rapidly if exposed to heat, so venting is needed
- Hydrogen leaks through the smallest of seams
Now imagine trying to build a tank that prevents all that from happening, and it has to be lightweight for usage on spacecraft / aircraft.
In french we differenciate "batterie" and "pile", "pile" are one use, but I thought due to the name that the hydrogen cell would store energy.