Pepper and Water | Science Experiments for kids | Pepper and soap trick
Pepper and Soap Experiment
In this experiment, you’ll use pepper floating on water to demonstrate how soap affects the surface of water. This is a quick experiment, but it’s so fun to watch that you’ll want to repeat it several times.
- Shallow bowl or pie tin
- Dish soap
- Fill the bowl or pie tin with about an inch of water.
- Sprinkle pepper evenly across the surface. Try not to sneeze! The pepper flakes should float, not sink, upon the surface of the water.
- Squeeze a tiny bubble of dish soap onto a clean counter.
- Touch the tip of the toothpick to the bubble of dish soap. You’ll want just a tiny amount of soap on the end of the toothpick.
- Set the toothpick carefully aside and pick up your notebook and pencil.
- What do you think will happen when you touch your soapy toothpick to the water? How will the pepper flakes react?
- Write down your best, often called a hypothesis, in your notebook.
- Now poke the soapy toothpick into the water, right in the center of the tin.
- What happens? Was your hypothesis correct?
Most of the pepper flakes should have darted to the sides of the pan, and some of the flakes should have fallen to the bottom of the pan. It may have looked like the soap was chasing the pepper flakes away.
Pepper and Water Science Magic
The pepper and water science trick is one of the easiest magic tricks you can perform. Here’s how to do the trick and an explanation of how it works.
- black pepper
- dishwashing liquid
- plate or bowl
How the Pepper & Water Trick Works
When you add detergent in water, The surface tension of the water gets lowered. Water normally bulges up a bit, like what you see when you look at a water drop. When the surface tension gets lowered, the water wants to spread out. As the water flattens on the dish, the pepper that is floating on top of the water is carried to the outer edge of the plate , which looks like by magic.