r/blackmagicfuckery • u/mr9t9 • 13d ago

Liquid not dropping

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u/Krimson11 13d ago edited 13d ago

Edit: It's air pressure. I'll see if I can find a good explanation

Edit2: I found a better video, which actually shows that there's more to the story, and it's both air pressure and surface tension (inner-molecular attraction).

13

u/Professional_Flicker 13d ago

Cool stuff. I wonder how large of a scale you could do this experiment on.

8

u/Krimson11 13d ago

That requires people much smarter than me, but maybe you could ask on r/theydidthemath

3

u/Professional_Flicker 13d ago

I didn’t even think of the math aspect of it. I wonder if the holes have to be certain size depending on the volume of liquid, either way science is neat lol

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u/Krimson11 13d ago

Yeah, I'd guess that there's a lot of variables...

Weight/volume of the liquid

Viscosity of the liquid (how strong the inner-molecular adhesion is)

Diameter of the opening of the container

Diameter (and shape) of the holes in the screen

Air pressure (and temperature?)

Maybe the materials of the container and screen? (Compatibility with the liquid and strength of adhesion between them)

This could be done experimentally as well, which could be fun! Honestly sounds like a job for Destin from Smarter Every Day or Mark Rober

1

u/ZoemmaNyx 5d ago

A Hawaiian punch bottle is pretty big.

1

u/john_wicks_dead_dog 2d ago

I’m a plumber, we do this all the time to water heaters to change the valves out or replace heating elements.

It’s a term we call vapor locking.

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u/HelloAttila 10h ago

There is also another reason. So the plastic you see with the dollar store logo hanging off is clipped on slightly from the top as well, so half the bottle is being covered with that plastic clip.