Yeast Experiment

Ingredients: Yeast, sugar, warm water.
Equipment: bottle and balloon
Method:
Clean the bottle.
Put 2 tablespoons of warm water into the bottle.
Add 2 tablespoons of yeast to the bottle.
Put 1 teaspoon of sugar into the bottle.
Mix it together.
Put the balloon on top of the bottle.
Let the yeast and sugar rest by a sunny window sill.

Results: The balloon rose up because of the yeast, sugar and warm water. It created a carbon dioxide gas!