The Year 6s set up an Investigation into what affects yeast. They discovered that a bottle with the combination of yeast, sugar and warm water caused the balloon (that was placed over the top of the bottle) to go up. The other bottles with different combinations did not make the balloon go up. They thought it could be because:
1. a reaction had occurred
2. a gas had formed
3. the yeast has used the sugar (as yeast is a living organism) and this had caused the gas
They were to research what had happened for homework!