Walking Water Experiment: A Fun Rainbow Science Activity for Kids
The walking water experiment is a simple and engaging science activity that kids absolutely love. Not only is it fun to watch, but it is also a great way to introduce basic science concepts like capillary action and color mixing.
If you are looking for an easy STEM activity to try at home, this walking water experiment is a perfect choice.
What Is Capillary Action?
Before starting the walking water experiment, it helps to understand what is happening.
Capillary action is the ability of a liquid to flow through narrow spaces without the help of external forces like gravity. In some cases, it can even move upward against gravity.
This happens because of two forces:
- Cohesion: the attraction between similar molecules
- Adhesion: the attraction between different molecules
These forces work together to pull water up through the paper towel during the walking water experiment.
Capillary action is incredibly important in everyday life. It helps plants pull water from their roots to their leaves and allows blood to move through tiny vessels in our bodies. Without it, life as we know it would not exist.
What You Need for the Walking Water Experiment
To set up your walking water experiment, you will need:
- 5 clear glasses
- Red, yellow, and blue food coloring
- 4 paper towels
- Water
How to Do the Walking Water Experiment
Follow these simple steps to create your rainbow:
- Fill three of the glasses with water, leaving two empty.
- Add a few drops of red food coloring to one glass, yellow to another, and blue to the third.
- Arrange the glasses in this order:
blue, empty, yellow, empty, red - Fold each paper towel into a long strip.
- Place one end of each paper towel into a glass and the other end into the next glass, connecting all of them.
Once everything is set up, your walking water experiment begins.
If it helps to watch a demonstration of this walking water experiment, check out this great example by Science Buddies.
What Happens During the Walking Water Experiment
Almost immediately, you will see the water start to move up the paper towels. The water travels upward against gravity and then flows down into the empty glasses.
Within about 20 to 30 minutes, the empty glasses will begin to fill. As the colored water mixes, new colors appear:
- Blue and yellow make green
- Yellow and red make orange
By the end of the walking water experiment, the water levels will be equal in all the glasses, creating a beautiful rainbow effect.
Turn It Into a Learning Activity
This walking water experiment is a great opportunity to ask kids questions and make predictions.
Before the colors mix, ask:
- What color will blue and yellow make?
- What happens when you mix yellow and red?
You can also talk about how the water is able to move and why it stops once the levels are equal.
Why Kids Love the Walking Water Experiment
The walking water experiment is a favorite because it combines science and creativity. Kids get to watch something happen in real time, and the colorful results make it even more exciting.
It is also:
- Easy to set up
- Mess-friendly
- A great introduction to STEM learning
Final Thoughts on the Walking Water Experiment
If you are looking for a simple and memorable science activity, the walking water experiment is always a hit. It is quick to set up, fun to watch, and packed with learning opportunities.
My kids loved seeing the colors come together to form a rainbow, and it sparked great conversations about science along the way. Give this walking water experiment a try and see the magic for yourself.
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