||To make the largest, longest-lasting bubble.
||To demonstrate surface tension.
||Any number of individuals or teams.
About 150 ml dishwashing detergent
(Joy - renamed Dawn - is the best from experience) and 1 L of water.
A flat container at least 30 cm X 30 cm X 8 cm .
2 plastic drinking straws.
80 cm of string.
Each team/individual has 5 tries to make the largest and longest-lasting
When making the bubbles, contestants must stand in front of a
piece of cardboard (affixed to a wall) which has a grid-work of
lines running horizontally and vertically. These lines should be
1 cm apart, thus forming squares 1 cm X 1 cm.
By using the grid as a background, the judges can determine the
size of the bubble to the nearest centimetre.
Thread the string through both straws (easy if sucked through).
Knot the string and trim off the ends of the knot and pull the
knot inside one of the straws. Pull the straws apart to make the
frame (see diagram on back).
Mix your water and detergent until you are satisfied you have
the best combination for making large, long-lasting bubbles.
Dip the bubble frame into your bubble solution and make your first
attempt at bubble formation
||Largest bubble scores 25 points and all subsequent ones score one
point less according to rank of size.
Longest-lasting bubble scores 25 points and all subsequent ones score
one point less according to time rankings. Largest combined score
wins the event.
||Youth Science Foundation