Do you have youngsters at home who love blowing bubbles and popping them? Well, it is indeed fun and exciting. Give your kids a chance to make their own bubble solution. It will be a great STEM activity for them! 

What you’ll need 

• Liquid dish soap (half cup) 
• Warm water (3 cups) 
• Clean container with a lid 
• 1 table spoon of glycerine 
• Bubble wand 

How to 
Here is a step-by-step guideline for this fun STEM activity. Help your kids follow them.   

• Ask your kids to pour the warm water into the container. 
• Next, have them gradually add the liquid dish soap. Once added, ask them to stir the container gently to prevent the formation of suds. 
• Wait for the warm water and the liquid dish soap to mix thoroughly. Once it happens, ask him to add the glycerine to the solution. The key is to stir again to let the glycerine blend with the entire solution. 
• Finally, explain to your kids that they need to let the bubble mixture sit overnight before actually blowing them.  
• The next morning, the bubbles will be ready to be blown.  

What’s happening in this experiment?  
Bubbles in the above experiment consisted of a thin film of soap made up of three layers: A layer of water in between two layers of soap (one on the inside and one outside the bubble). Now, when this sandwiched layer of water gets a chance to evaporate, the bubble bursts. However, when glycerine is added to the solution, the thickness and density of the solution enhances, creating a barrier that slows down the rate of evaporation. This makes the bubbles stronger and bigger as well.  

Also, soap works better than other liquids as it has lower surface tension (force that holds liquid molecules together and gives them elasticity). This means soap allows easy formation of bubbles as the molecules in it are held loosely together.