She read it from those books I haven't got time to read, which I want to impress my children. :-)
We did some baking during the half term holiday. After everything went to the oven, before I had a chance to tidy up, Lucy started to open the draws in kitchen, asking for some sugar and a balloon.
Then we did this.
We need some bread yeast, water bottle, sugar and a balloon.
We just added some water and yeast in the water bottle, then a tea spoon of sugar. We then stretched the balloon over the top of bottle.
Gave the bottle a good shake. See photo 1
The balloon was blowing up slowly. Photo2 was taken after couple of hours.
Bread yeast consumes food like Starches (chain of sugars) from flour, or just simple sugar. The yeast enzymes break down sugars to grow and multiply, and produce carbon dioxide as a by-product.
I think it is the better way to show children how bread has holes inside.
Some other ideas related of this experiment.
You can have two bottle of these, one with room temperature water, one with warm water. Which balloon blows up faster? :-)
Can we use fruit juice instead of sugar?What is going to happen?
We will do those experiments during the summer holiday.
Have fun!
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