#35 Using yeast to make bread and beer

Yeast is a single celled, microscopic fungus which uses sugar as food. It is widely used in food industries such as baking and brewing.

Baking

• Mix yeast with flour, sugar and H₂O to make dough.
• Kept dough warm: Yeast respires sugar to produce CO_2. This make dough rise.

• When the bread is baked, the yeast is killed.

 

Brewing

• Yeast respires sugar (from juice, grain) to form ethanol and CO₂.
• The ethanol makes the drink alcoholic, carbon dioxide gives the drink its fizz.
• The process is called fermentation.