Microbial strain to make a natural soda
Learn while having fun!
Have your students make a natural soda from a mixture of strains of micro-organisms that they can observe!

Why does my soda fizz  Between the respiration and dissolution of gases depending on the temperature, tackle interesting themes around a simple drink!

Composition for several litres of soda:
Train of fruit KEFIR, 4 g (Saccharomyces cerevisae; Lactococcus lactis; Leuconostoc mesenteroides; Lactobacillus paracasei).

Necessary material:

• a lemon, ideally dried figs
  
• food sugar
  
• Erlenmeyer flask, jar or bottle with cap
  
• stereo microscopes or microscopes for observation