Sunday, July 29, 2012

Baking Day Yeast Science Experiment

We made homemade bread and jam this week...we'll save that story for another day.  While we waited for the dough to rise at various stages in our baking, we did a little side experiment.  This experiment was meant to demonstrate to the kids why our bread dough would (hopefully) rise.  

yeast experiment for kids

Our supplies
a small, empty water bottle
a balloon
a packet of rapid rise yeast
a cooking thermometer
warm water between 110 - 120 degrees Fahrenheit
1 tsp of sugar 

yeast science experiment for kids

How we did it

Little J emptied a packet of yeast and a teaspoon of sugar into the empty water bottle.  Sassyfras  measured the temperature of the water and filled the bottle just over half full.  Juiciness, with a little help, placed the balloon over the bottle mouth.  Then we waited.  After about 30 minutes our balloon started to inflate...and fortunately, so did our bread!  

Why it works
As the yeast begins to eat the sugar and multiply, they give off carbon dioxide gas that has nowhere to go, but into the balloon.  Science Bob has nice explanation as to why this happens and why this helps our bread.


Photobucket 

Linking to:  Science Sunday, It's Playtime!, Weekly Kids Co-op, TGIF!

6 comments :

Christy said...

Great experiment!

MaryAnne K said...

I love this experiment!

Raising a Happy Child said...

Great experiment. A vegetarian son of a friend of mine is refusing to eat bread now, "because yeast is alive too" :)

Leslie said...

oh cool!! you guys do the coolest projects.

Phyllis said...

We did this Thanksgiving week! It is quite fun.

Ticia said...

Science Experiments in the kitchen are the most fun.

Thanks for linking up to Science Sunday!