gak bubbles

When it comes to S.T.E.A.M. gak is where it's at!

When it comes to S.T.E.A.M. gak is where it's at!

Let’s start with a mind-blowing scientific fact: Under a powerful microscope, you can see that good old white glue is made up of millions of strands of molecules all linked together like chains. It’s a petroleum-based goop we call a linear polymer. When liquid starch is mixed into the glue, a chemical reaction occurs as it connects to those long strands of glue molecules, taking on the qualities of a cross-linked polymer that we call gak. This slippery mixture is fun to play with and quite moldable. In this experiment, we’ll use it to create giant bubbles with the help of a household plastic straw.

Gak Bubbles

What You Need:

  • Food coloring (optional)
  • Measuring cups
  • Mixing bowl
  • Liquid starch
  • Plastic straws
  • Rubber spatula or spoon
  • Water
  • White glue

What You Do:

  • Pour 1.5 cups white glue into the bowl
  • Add liquid starch and mix
  • Add water and mix
  • Keep adding small amounts each to the glue until a solid mixture forms
  • Remove gak from the bowl and mold into a blob
  • Insert straw and blow!