Hydrogen can lift ~10% more than Helium. Hydrogen can escape easier so I'd imagine heaver material would need to be used. Hydrogen rocks cause it's cheap. Hel

Hydrogen can lift ~10% more than Helium. Hydrogen can escape easier so I'd imagine heaver material would need to be used. Hydrogen rocks cause it's cheap. Helium is pretty expensive. Hydrogen has a PR problem. But we drive around on top of a flammable fuel quite happy so that might change.