Finn wanted to do a science experiment, so we did this one.
Our question: Will a balloon float when it has water and air in it.
Equipment: Yellow party balloon, funnel and water
Prediction: It would float
Method: put water in the balloon with the funnel. Blow some more air into the balloon. Put the balloon in the basin with some water.
Observation: Yes, it floated.
Conclusion: A balloon with water and air is lighter than water.
The end.