Running Pepper and Soap Experiment

A Peculiar Playdate #9 ∙ Published May 10, 2019
Running Pepper and Soap Experiment - Holding Pepper
Hold on, how can a pepper run? What sort of pepper is that? Well, it’s a regular ground black pepper that we are certain you have in your kitchen. It is running away from the soap, inside the plate full of water. Let’s dig deeper into how it all works.
What you need
  • A plate
  • Some water
  • Regular ground pepper (or any other pepper will do)
  • Something soapy. Can be a regular soap. We used dish soap.
Running Pepper and Soap Experiment - Black pepper, plate and soap
How to make it
Running Pepper and Soap Experiment Step 1 - Pouring water on the plate
Step 1
Fill in the plate with water
Running Pepper and Soap Experiment Step 2 - Sprinkle pepper on the plate
Step 2
Add ground pepper to it
Running Pepper and Soap Experiment Step 3 - Putting Soap on the Finger
Step 3
Put some soap on your finger
Running Pepper and Soap Experiment - Step 4 - Putting Finger in the Plate
Step 4
Put this finger in the middle of the plate
What happens
You’ll see that the pepper runs away from your soapy finger!
Running Pepper and Soap Experiment - Pepper in the water on the plate
Running Pepper and Soap Experiment - Pepper runs away when putting finger on the plate
Why it happens
Firstly, let’s start with soap. Soap molecules have one end which is hydrophilic (water-loving) and the other hydrophobic (repelled by water). When you put your soapy finger in the water, the hydrophobic one breaks the water surface tension. As a result of that water around the edges of the plate pulls away and takes pepper with it.

Feathers in exchange for prizes

While working on this playdate idea, our Keedoo Parrot has lost two feathers 😔 Please help us! Collect them by bringing this idea to life with your kids, and we will gratefully exchange them for valuable prizes.
  1. Try making this experiment
  2. Share your experience on Instagram or Facebook
  3. Mention @keedooapp in comments
  4. Nominate two families to do the same
  5. We will contact you to add two feathers to your Keedoo account that you can exchange for prizes in our mobile app
  6. Follow @keedooapp on Instagram to see new prizes
Spread the word 🙌
Share on facebook
Share on google
Share on twitter