Giant soap bubbles

Making soap bubbles makes any outdoor activity much funnier – specially if there is a smooth breeze to take them to the sky. The size of both the soap bubbles or the huge tubes depends on the used materials as well on the students’ expertise. The soap bubbles have no colour, but their amazing structure and the light properties make visible a complete rainbow. The outer surface that keeps the air inside is a thin water sheet isolated between two thin layers of soap molecules. It’s the way the light interacts with these layers that creates the colours we can see.