You know like the kind that go on a window or bathroom mirror or on the wall or in the shower. They need the atmosphere pushing down on them to work, right?
You know like the kind that go on a window or bathroom mirror or on the wall or in the shower. They need the atmosphere pushing down on them to work, right?
That’s what I was thinking too, you would need to have the pressure outside the cup to be higher, that’s the force keeping the cup “sticking”.
My prediction is that if you were to stick the cup while under atmospheric pressure, it would have a small amount of air inside … making it unstick more easily after the outside gets depressurized, compared to the condition of having stuck the cup while in vacuum, although the difference would properly be negligible.