Who doesn’t love bubbles? They’re fun, colourful, and full of science. Playing with bubbles isn’t just fun for children – it’s also a brilliant way to explore physics right at home. From air pressure to gravity, bubbles can help children discover how the world works through hands-on play.
Even better, you don’t need to be a science expert to guide your child. These simple bubble experiments will help your family explore the wonder of physics together – and we’ll show you how to explain the ideas behind them in plain English.
Why Bubbles Are Perfect for Learning Physics
Bubbles are an amazing example of everyday science in action. When your child blows a bubble, they’re watching air pressure, energy, and surface tension all working together.
The great thing about bubbles is that children can see physics happening. The shimmering film, the floating shape, the final “pop” – it’s all caused by natural forces. And because bubbles are safe, cheap, and quick to make, they’re an ideal way to bring science home.
But don’t worry if words like “surface tension” or “pressure” sound intimidating. You don’t have to be a teacher to help your child understand. Throughout this article, we’ll show you how to explain these ideas simply, and where to look if you’d like a bit of extra support.
What You’ll Need
Before you start, gather these simple materials from around the house:
- Washing-up liquid (a few tablespoons)
- Warm water (around 500 ml)
- Glycerine or sugar (optional, for stronger bubbles)
- Straws and cups
- Pipe cleaners or string
- A bowl or tray
Mix two tablespoons of washing-up liquid into 500 ml of warm water and stir gently. If you want your bubbles to last longer, add a teaspoon of glycerine or sugar. Now you’re ready to begin!
1. The Classic Bubble Experiment – What Makes a Bubble?
This first experiment helps children explore how bubbles form.
Instructions
- Dip a straw into your bubble mixture.
- Blow gently to create bubbles.
- Watch their size, colour, and how long they last.
Explaining the Science Simply
Every bubble has a thin layer of soapy water wrapped around air. The soap helps the water stretch and hold together. That’s what scientists call surface tension – it’s what allows the bubble to stay in shape without bursting straight away.
If you’d like to read more about how surface tension works, BBC Bitesize has a great section on liquids and forces written in child-friendly language. You could also ask a science tutor to demonstrate it using fun props – like balloons or sponges – to make it easier for your child to visualise.
2. Bubble Shapes – Why Are They Always Round?
This activity shows that bubbles always form spheres – even if you try to force them into other shapes!
Instructions
- Bend pipe cleaners into a cube shape.
- Dip the cube into your bubble solution.
- Look closely at the films and bubbles that form inside.
How to Explain It
Even though your frame is a cube, the bubble inside is round. That’s because the water film pulls itself into the smallest possible shape – a sphere. It takes less energy for a bubble to stay round than to stretch into corners.
To explain this to your child, you might say:
“Imagine the bubble is trying to use as little energy as possible – like when you curl up under a blanket to stay warm.”
If you want to check your explanation, websites like Khan Academy and Science Sparks offer free, easy-to-follow videos and articles that describe why shapes form the way they do.
3. The Bubble Tower – Balancing Air Pressure and Gravity
This one looks impressive and teaches about balance, pressure, and weight – even if you don’t use those words!
Instructions
- Half-fill a cup with your bubble mixture.
- Blow through a straw to build a tower of bubbles that spills over the rim.
How to Explain It
As you blow, you’re adding air into the liquid. Each bubble presses on the ones below, and gravity pulls them down. The taller the tower, the heavier it becomes – until the bottom bubbles burst.
You could explain it by saying:
“The air you blow is like a gentle lift pushing the bubbles up, but gravity is always trying to pull them back down.”
If you’d like to understand this more clearly, you could explore the “Forces and Motion” section on Physics Classroomor ask a local physics tutor to demonstrate air pressure using simple props.
4. The Unpoppable Bubble – How to Strengthen a Bubble
Instructions
- Add a spoon of glycerine or sugar to your bubble solution.
- Blow a large bubble on a flat plate.
- Wet your finger in the mixture, then touch the bubble.
How to Explain It
Normally, dry fingers pop bubbles because they break the thin layer of water. But if your finger is wet, it slides smoothly over the bubble film instead of tearing it. The sugar or glycerine makes the film thicker, helping it last longer.
You can tell your child:
“Dry things make the bubble tear, but wet things glide over it gently – that’s why it stays whole.”
If your child enjoys this, the book Basher Science: Physics (published by Kingfisher) explains these ideas in a fun, cartoon style that’s great for primary-age learners.
5. Bubble in a Bubble – Learning About Pressure
Instructions
- Blow a large bubble on a plate.
- Carefully insert a straw through the film and blow again to create a smaller bubble inside.
How to Explain It
The air inside the small bubble is under more pressure than the big one. Because it’s smaller, the air has to squeeze into a tighter space. That’s why the inner bubble looks firmer or shinier.
To explain, you might say:
“It’s like trying to fit the same amount of air into a smaller balloon – it feels tighter inside!”
If you’re not sure how to describe “pressure”, BBC Teach and National Geographic Kids both have simple articles and short videos that explain it beautifully.
6. Frozen Bubbles – Exploring Temperature and Change
This one’s perfect for chilly mornings.
Instructions
- Use a sugar-rich bubble solution.
- Go outside when it’s below freezing.
- Blow bubbles and watch them turn frosty!
How to Explain It
When it’s very cold, the water in the bubble film freezes into tiny ice crystals. This is the same process that turns puddles to ice.
Tell your child:
“When the air is cold, the water in the bubble slows down and freezes, just like the pond does in winter.”
This experiment links beautifully to the topic of states of matter. For more visual examples, check out Twinkl’s Science: States of Matter resources or discuss it with a tutor, who can demonstrate using ice, steam, and water.
7. Bubble Races – Investigating Airflow and Movement
Instructions
- Blow a bubble onto a flat table.
- Use gentle puffs of air to move it forward.
- See how far it travels with soft versus strong breaths.
How to Explain It
When you blow, the moving air pushes the bubble forward. If you blow too hard, the air pressure becomes too strong and pops it.
You could say:
“The bubble moves when the air pushes it – but if we push too hard, it bursts!”
This simple game introduces children to the basic concept of forces and motion. For a visual explanation, the Institute of Physics (IOP) has excellent free animations and short experiments that show how forces act on objects.
Helping Your Child Understand Physics (Even If You’re Not an Expert)
Many parents worry they won’t know how to “teach” the science behind these experiments – and that’s completely normal. The goal isn’t to deliver a lecture, but to share curiosity.
If your child asks “Why?”, it’s perfectly fine to say “Let’s find out together.” Here’s how to do that:
- Use trusted websites: BBC Bitesize, National Geographic Kids, and Science Sparks all explain science in child-friendly terms.
- Read short guides: The Usborne 100 Things to Know About Science book is a fantastic family resource.
- Ask a tutor: A qualified physics tutor can demonstrate these principles hands-on and tailor explanations to your child’s age and ability. Many tutors also offer online sessions that make learning even more convenient.
The most important thing is to make science enjoyable. Children remember ideas far better when they’re linked to laughter, questions, and discovery.
Final Thoughts
Bubbles aren’t just beautiful – they’re a gateway to physics. Through these simple experiments, children can learn how air, pressure, and temperature work, all while playing.
You don’t need to know all the answers. Just be curious, explore together, and use the resources around you. With a little support from books, websites, or a friendly physics tutor, you can turn a pot of bubbles into a science lesson your child will never forget.