Effusion – “Helium vs. Hydrogen Atom Size” Review

In 2021, I wrote a blog post Helium vs. Hydrogen atom size exploring why I prefer hydrogen over helium for lighter-than-air applications. One of my key arguments was that hydrogen molecules, being larger (kinetic diameter 289 pm vs. helium’s 260 pm), should leak more slowly through the airship envelope. I likened this to a tea Continue reading Effusion “Helium vs. Hydrogen Atom Size” Review