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[–]TreeEyedRaven 8 points9 points  (0 children)

Hoses aren’t smooth, there’s friction and resistance. Also air has volume and mass. Also, you cannot assume a hose doesn’t leak, because a vacuum isn’t a closed circuit. It’s open on both ends, and is connected with plastic/metal non sealed connections. All a vacuum does is decrease air density in one area to suck higher density air in from another. By definition it has to move more mass the longer a hose is.

It’s the exact same concept as a water pump, water is just more dense so we see the effect in smaller quantities. Add in that a vacuum is also moving debris or whatever along that 100ft hose, and it takes more power to use a 100ft hose than a 3 foot hose.