hey I'm Diana you're watching physics girl and a video that I really like to make is a bunch of different science experiments that you can try at home so we bought all the materials for like six different experiments which is a lot of milk in my fridge that says do not drink but we didn't even get past the first experiment because it was so cool so this video is gonna be a listicle of one check it out when you put a thin rod like a glass stirring stick into a fluid that has specific properties and then spin the rod it does something fluids don't usually do the fluid travels up the rod not all fluids would do this of course I know you know that purple stuff has special properties it's the most viral fluid on the Internet this is slime and what we're seeing here is called the Weisenberger effect it's not normal behavior for a fluid if you've ever beaten brownie mix you know that the fluid tends to fly off in all directions and it certainly doesn't climb in and up the mixer it climbs into my belly though so the Weisenberger fact happens with non-newtonian fluids and I'll talk about what those are but it's so cool we wanted to be able to visualize how the fluid is moving so we made a few different colors of slime and then put them together in a container so we could draw the liquid up the rod from the point where all the colors meet this was just an excuse for me to make pretty colors I love colors so this is what happened with the colors why does this happen what is the Weisenberger fact besides just another effect named after some dude I talked to my friend Dan who's a plasma physicist and also happens to be the friend who helped me with the colors about what's going on so this is a they call it slime it flows like a fluid so if I hold it like this it'll it'll flow as if it's a fluid but if I pull it suddenly it even snaps in half the fluid moving around and getting dragged along this pen that's going to happen in any fluid even water yeah but with this fluid this material also has a unique property called visco-elasticity not only is this fluid viscous but it will bounce back to its original position that's not the case with all fluids the elasticity of this fluid makes it want to come back to its original position right so I'm gonna use this string as a model for that so as this turns that's the sound of science it wraps up this string or the fluid and it's tightening as it goes that creates a tension when you have a tension that's pulling around it actually creates an inward force that causes it to collapse so think about what's gonna happen when this this cylinder of fluid starts to squeeze in it's gonna push the inner fluid up and that's what's driving the whys and Burt effect to send this up higher and higher the rod so the upward motion of the Weisenberger fact is essentially the fluid squeezing itself up the rod a nice self hug it's also kind of like spaghetti when you twirl it around a fork accepts spaghetti is not a liquid until it's in my belly I'm hungry I mentioned that this works with non-newtonian fluids and I didn't tell you what those are so a Newtonian fluid is a fluid that acts normally it's like water if you saw if you suck water up a straw the harder you suck the more water will come up but with non-newtonian fluids if you put something called shear shear strain on them which is kind of this sliding kind of motion there's some non-newtonian fluids like this kind like slime that gets thicker they're called shear thickening fluids and it's the elasticity plus the shear thickening of the slime that causes it to tighten around itself as you're stretching it out with the twists fluid dynamics this experiment this demo you must try at home and if you want to make your own slime and do the Weisenberger here's the recipe that we used 1/2 a cup of water mixed with half a cup of PVA glue or that washable multi-purpose white glue it's Elmer's people and then separately mix half a cup of warm water and a quarter teaspoon of borax then mix all that together then profit you can also add food coloring to the water or add glitter or mashed bananas or whatever you want and the key to seeing the Weisenberger fact is to get a rod that you can make spin slowly you can even do it by hand with some types of non-newtonian fluids and if you want to turn this into an experiment rather than just a demo try controlling the amount of borax versus the amount of glue that you put in and see if that affects how far you can get it to climb up the rod or try something else but whatever you do if you try this at home you better tweet it at me use the hashtag science slime since science land for science thanks for watching this video I've got another video that's a bunch of fun demos you can do with water so check that one out subscribe if you want more physics and happy physics things hey I'd like to thank curiosity stream for supporting PBS Digital City as curiosity stream is a subscription streaming service that 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