- Dawn Dishwashing Liquid
- Glycerin (Available at Drug Stores)
- Tap Water
- Wire Coat Hanger
- Shallow Tub or Tray
Mix a bubble solution of 2/3rds cup of Dawn dishwashing liquid and 1 tablespoon glycerin in one gallonn of water. More durable bubbles form if you let the solution age for at least a day, preferably a week. Bend the coat hanger into a flat loop with the hook as a handle. yarn wrapped tightly around the wire will absorb the bubble solution and make the hoop easier to use. Fill the shallow tray with bubble solution and submerge the hoop in the solution. Tilt the hoop toward you until it is almost vertical and lift it from the tray. a bubble film should extend across the hoop. Swing the hoop through the air to create a giant bubble. Twist the hoop to seal it off at the end.
What's going on?
Water molecules are strongly attracted to one another. This is known as suface tension. Normally, surface tension makes it impossible to stretch the water out into a thin film. Soap reduces the surface tension an dallows the film to form. Soap film always pulls in as tightly as it can so it will form a sphere, because a sphere is the shape that has the smallest surface area compared to it's volume. Glycerin keeps the bubble from drying out and bursting.