 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is the shooting pepper experiment. What you need for this experiment is a plate, soap, dish soap, water, and of course pepper. So to set up this experiment you take a glass of water, a flat plate, and just pour the water on there. Make sure the plate's a little bit angled up so of course the water doesn't spill out. Bring it up out all the way to the rim there and then what you're going to do is take your pepper and you're going to lightly sprinkle it across. You don't want, in this experiment, you don't want to have a whole bunch of pepper. You just want it lightly sprinkled so it's basically covering all the water. That's just about right right there. So put a little bit of soap on your finger. Put your finger in the middle of the water. Put it all the way in and once you pull it up there goes the pepper. It shoots all the way out. So the science behind this is the reason the pepper sits on the water is because the water is a high surface tension. The water molecules are strongly attracted to each other. Pepper is a hydrophobic so what meaning that the water is attracted to it because of that the pepper does not dissolve in the water but it floats. So the question is why does the pepper shoot to the sides when the dish soap touches the water? The soap is able to break down the surface tension of the water and that's part of what makes the soap a good cleaner. As the soap moves into the water and the surface tension changes the pepper is no longer floats on top but the water molecules still want to keep the surface tension going so they pull back away from the soap carrying the pepper along with them. So in this experiment I'm using less pepper here and so you'll see it'll shoot all the way to the sides where if I use more pepper it's not going to shoot all the way to the sides. So I decided what happens if I actually use two fingers on opposite ends so here I'm going to try it and it completely divides it right down the middle so therefore I started thinking well if that works how about if I try it with more pepper this time that was a little bit of pepper I'll try the same thing with more pepper and you can see it does not bring it in as far because there's more pepper taking up the space of the water surface. So now I'm going to try four fingers here I get it going and that's a pretty cool design there that was pretty cool to be able to use four fingers and watching how the soap breaks that down. So I hope you enjoyed this video if you did remember to share and click a thumbs up and thanks for watching.