Helium has problems of its own, sadly. Besides being a little bit less effective at actually lifting, it’s relatively scarce on Earth and it leaks even faster than hydrogen
I mean, we could be using the heavier neon, which is also a noble gas and lighter than air. But it’s almost as rare as helium, and you’d need significantly more of it to produce the same lift.
Helium has problems of its own, sadly. Besides being a little bit less effective at actually lifting, it’s relatively scarce on Earth and it leaks even faster than hydrogen
I mean, we could be using the heavier neon, which is also a noble gas and lighter than air. But it’s almost as rare as helium, and you’d need significantly more of it to produce the same lift.