1. Dry Ice Experiment: Crystal ball
By: Kiran John, Luke Arnesen and Roshan Ganesh

2. Question
Which type of soap will make the biggest dry ice crystal ball?

3. Hypothesis
If we put Dawn, Ajax, and Ultra Joy on different towels and then spread the soap, using a towel, in a thin film on the bowl with dry ice and water in the bowl then Ajax will have the biggest average bubble.

4. Materials
Tape measure
Bowl
Dawn
Ajax
Ultra Joy
Towel
Dry Ice
Gloves

5. Variables
Control variables: Manipulated variable: Responding variable: Bowl Type of dish soap The size of the crystal ball Dry ice Towel Gloves Tape measure

6. Procedures Get Materials needed for experiment Put dry ice in the bowl
Put water in the same bowl
Soak towel with Dawn
Slide towel over bowl
Measure the bubble
Wash bowl
Repeat steps 1-3
Soak towel with Ajax
Repeat steps 5-7
Soak towel with Ultra Joy
Repeat steps 5-7 Do experiment 3x

7. Results

8. Conclusion
My hypothesis was supported because I thought Ajax would create the biggest bubble on average and I was right.

9. Explanation
The different sizes of bubbles could be explained by the temperature of the water, the amount of water, the amount of soap, and/or the chemical composition of the soap.

10. Problems
One of our problems was that the Ajax’s dry ice piece weighed 0.1 ounces more than every other piece, we solved our problem by making a graph and finding the slope. We also have reason to believe that we used cold water for dawn, but hot water for the others.

11. More Questions How big would the bubble be we other soaps?
How about hand soaps?
How long would the ball last if you took out the dry ice?