Surface Tension Can Hold Water in a Glass

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I show you how water can be held in a glass with a screen and some water

#shorts
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I’ve seen this with a plastic cap, and I thought this was gonna be a debunking, but I was way more happy to see something actually cool

Miipmiip
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it's not just the surface tension of the water.
the air bubble at the top of the jar is at negative pressure because the weight of the water is pulling on it, and the surface tension denies air from getting through the small holes in the screen.

Increase the pressure in the air bubble and it will push the water through the screen.

alfuriusstraut
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Incredible. Honestly these videos are really interesting and can actually teach something. Science is amazing!

senseiratty
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Atmospheric pressure (14.7 PSI) is the main force that pushes upward to hold water in place.
Notice the small amount of water that initially drains out the bottom to create a void at the top of the jar. That void is less than standard atmospheric pressure and therefore the 14.7 PSI pushing up from bottom is what holds the water in place. Once you tilt the jar sideways and connect the void to atmospheric air pressure, that pressure differential is no longer present and the water flows out due to a gravitational force.

gbarton
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Reminds me of the joke of having a screen door on a submarine.

micahgoingback
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so unrelated and dumb but small things bring me joy

i noticed the water was slightly coming out of the top when he poured it and i was like “is there like a film or wire mesh over it or something” and i am so happy i got it right so unrelated but i’m just so proud(and i know no one asked before anyone says that I just felt like being like i’m proud because i have nothing else to do atm :’)

edgypablo
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Me who watched the first 30 seconds and went to do this in front of my parents just to learn that there is a screen on the surface while mopping the floor: :O

atuvan
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Well done bro! You just mastered the art of hamon breathing

theonenamedE
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I just thought i can get a big glass of water and do this trick to my parents

prisonlessungabunga
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Thanks for making science fun and understandable!!

sallykauth
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Just want you to know your videos are really interesting and fun to watch, ty for making youtube more enjoyable

Zoe-yrxw
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The way you did this, it was more of a magic routine than a straightforward science explanation.

mcfry
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Minecraft when the chunks don’t load fully:

yups
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You are gonna achieve something!! All your videos have very clever ideas. ..

gundarsmiks
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I love learning from you. Even at 68 years old. I love that little light of more knowledge goes on in my brain.

robinmartz
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Our science teacher showed this when we were in primary school. I used to do this whenever I get free time. Memories came back alive 😇.

swagatsourabh
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Having done a physics experiment where my mission was to figure out how this worked, I can confirm that surface tension is a part of the equation. However, this effect is more due to air pressure, within the jar and outside the jar, and it’s actually crazy how little surface tension plays into this effect. Adding a surfactant, like dish soap, which normally breaks surface tension had the opposite effect in our experiments, instead making the water stay in the jar through more vigorous shaking.

knatgnat
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Thank you for being truthful and not saying it magic
Nice videos

jasono
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Daily dose actually had a clip of a teacher doing this but they didn't show the screen part. My mind melted when I saw all the comments talking about how cool it was that the water could be suspended just because of water tension, even Daily Dose fell for it. Kicker was that the teacher in the original clip even said there was a trick to it, but that part wasn't included in his video. Just in case any of you think this trick is possible without a lid or screen, it isn't. You can do it with a straw, but not with a mason jar or cup.

lasercat
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I'm so glad that you're teaching People certain physics. That actually pertained to our lives today. If people would only wake up and smell the coffee.

donchonealyotheoneal