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Why does this happen? If yeast has sugar and warmth, it gives off a gas called  carbon dioxide. This is what inflates the balloon.When yeast is mixed into bread dough, the carbon dioxide  gas produces tiny bubbles in the dough, which make the bread rise

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Pour the mixture carefully into a bottle. Fasten a balloon over the mouth of the bottle and stand it in a warm place, such as on a sunny window sill. Leave it for a hour or so and watch what happens.

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You need 1 tablespoon of dried yeast, half a teaspoon of sugar, about 1 tablespoon of warm not hot water, a bottle and a balloon.

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The balloon is going over the bottle and the air in the class of a bottle will go in the balloon.

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What is the balloon going to do.?