Make Homemade Bubbles and Compare Recipes

Not all bubble solutions are created equal—and making several recipes simultaneously and comparing them is a genuine scientific experiment that produces dramatically different results. A simple soap-and-water mixture makes ordinary bubbles. Add glycerin, and they become larger and last longer. Add corn syrup, and the bubbles are tougher and more elastic. Comparing these formulations teaches your child that small changes in recipe produce large changes in outcome—the core principle of experimental formulation in chemistry.

Bubble science is also rich in physics: bubbles are spherical because that's the shape of minimum surface area for a given volume (sphere is mathematically optimal). They're iridescent because light waves reflecting off the inner and outer surfaces of the soap film interfere with each other. These phenomena are real physics observable at bubble scale.

What You'll Need

• Dish soap — Dawn or similar concentrated detergent. This is the essential ingredient; brand and concentration matter.
• Water — Room temperature or slightly warm works best.
• Glycerin — Available at pharmacies. The key additive for stronger, longer-lasting bubbles.
• Light corn syrup — An alternative additive that also strengthens bubbles.
• Measuring cups and spoons — For accurate recipe comparison.
• Identical containers — One per recipe (small jars or cups).
• Bubble wands — For testing each solution. A bent pipe cleaner works well.
• A chart for recording results — Size, longevity, and bounce-ability of bubbles from each recipe.

How to Do It

1. Make three recipes simultaneously.

• Recipe A (Basic): 1 cup water + 2 tablespoons dish soap
• Recipe B (Glycerin): 1 cup water + 2 tablespoons dish soap + 1 tablespoon glycerin
• Recipe C (Corn syrup): 1 cup water + 2 tablespoons dish soap + 1 tablespoon corn syrup

2. Let the mixtures rest. Mix gently (foaming is the enemy of bubble solution—stir slowly) and let sit for 10–15 minutes. Bubble solutions often improve with resting.

3. Establish evaluation criteria. Before testing: "We'll compare which recipe makes the biggest bubbles, which makes bubbles that last longest, and which makes bubbles that can bounce on a sweater."

4. Test each recipe systematically. Use the same wand, the same breath force, and the same testing environment for each recipe. Record results on your chart.

5. Test the "bounce" property. Some bubble formulations (especially with glycerin) can bounce on a soft fabric surface. After blowing a bubble, try catching it on a lightly fleece-covered surface without popping. Test each recipe for this property.

6. Identify the best recipe and discuss why. "The glycerin recipe made the strongest bubbles that lasted longest. Glycerin makes the soap film more elastic so it can stretch more without breaking." The comparison produces data; the discussion builds understanding.

🎓 Skills Your Child Will Develop

• Formulation Chemistry — Understanding that small ingredient changes (adding glycerin) produce large property changes (stronger, longer-lasting bubbles) is the foundational concept of materials formulation—the chemistry used to design everything from medicines to plastics to food.

• Comparative Scientific Method — Running three recipes under identical conditions and comparing results on specific criteria is multi-condition controlled experimentation.

• Surface Tension — Understanding that soap reduces water's surface tension (allowing thin films to form) and that some additives strengthen that film builds an intuitive understanding of one of physics' most important surface phenomena.

• Spherical Geometry — Understanding that bubbles are spherical because that shape uses the least surface area to enclose a given volume introduces the geometric concept of optimization—finding the most efficient shape for a given purpose.

• Light and Color — Watching the iridescent colors shift across a bubble's surface as it moves introduces light wave interference in the most beautiful, accessible way available to preschool science.

Tips & Variations

• Giant bubbles: Tie a loop of rope between two sticks and dip in the best solution. Pull through the air to make giant bubbles. Giant bubbles show the color swirls and geometry at a dramatic scale.

• Square bubble: Construct a wire cube frame (bent wire bent into a cube shape). Dip in bubble solution, and the solution inside forms flat bubble faces—cubic, not spherical. This demonstrates that surfaces minimize their area relative to constraints.

• Document with photography: A bubble against a dark background and good lighting produces extraordinary iridescence. Photograph the bubbles with natural light as a backdrop to capture the color interference patterns.

My Two Cents

Bubble science earns its place in childhood experience because it provides the rare combination of physical beauty and accessible physics. The colors, the geometry, the way they drift and coalesce and burst—all of it is produced by real, understandable physics that children can learn while blowing and chasing bubbles on a summer afternoon. Add the comparative formulation experiment, and you've connected that beauty to the scientific practice of improving a recipe through systematic testing.