I was reading things about the Hyperloop One start-up project ( https://hyperloop-one.com/what-is-hyperloop) and I couldn't get any details on how the process works. This is a new transportation type which is being currently tested & studied.
Basically, they say it's a huge pipe network where the air pressure is greatly reduced. And via eletric rotors, a kind of giant capsule is propelled through this pipe.
My question is, how can the fact of reducing pressure can affect speed ?
Thanks for your englightenment I'm confused and I don't know what to search to have this information :)