Are you actually blowing air into the cup? Isn’t that impossible because the cup is full? Isn’t this actually an example of Bernoulli’s principle of moving air pressure? In other words, moving air has lower pressure. The fast moving air from the straw reduces the air pressure at the seam and lowers it enough to allow the water to escape. The escaping water is heavier than air falls and is replaced by air rising to the top of the glass. Otherwise you could just blow and would not need the straw. But that doesn’t create fast enough air speed to reduce the air pressure. No?
Nice experiment 👍, the only thing is that the vacuum keeps the water from coming out not the air pressure around us, that's why air flows to the top to replace vacuum therefore when you remove cup quickly the water will fall quickly because it's so little vacuum that cannot hold the weight of water, over roll good experiment.
use a fifteen meter long box so we know how much water we found as a limit of atmospheric pressure a fifteen meter cube above water surface so we got more pressure just below the water surface
I have question if u are in ur home the atmosphere presure is zero because the roof of ur house blocking all the air vertically going downward direction ?? I don’t understand
This is an excellent question. However you must realize that every house that’s ever been built has holes everywhere in it. There are vents in the attic, air can come in under the doors, air can come in even through the cracks behind and near the windows. So no house is ever really totally airtight, so it cannot block the air pressure from above. The only way to do something like that is to build a completely sealed house that’s absolutely completely sealed, and then you would have to pump out all of the air that’s inside only then would you have zero air pressure inside. Real houses can never have zero pressure inside, because there are holes everywhere the air can get in. Excellent question!
In every experiment to do with pressures, you need some sort of container! AGREE? Yet we are supposed to believe that earths atmosphere gets thinner the higher you go ,then simply meets the vacuum of space. Absolute fantasy!
