"@Tommasta - if you knew anything about physics, you'd realize that there is a vacuum formed between the cup and the water.
If you flip the cup, and any air is able to travel, water falls."
"Also, if the vacuum was strong enough, it would start evaporating the water, and all of the dissolved air in the water (if it was below the vapor pressure)."
"There's no way this would work under open conditions (atmospheric temperature and pressure).
An air vacuum, even highly industrial freeze dryer vacuums, do not have enough capacity to suspend water and keep it from falling into the tanks."
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