Question

what is fermentation and pasteurisation

Answer 1

fermentation process is when bacteria like yeast release certain gases and help in the baking
pasteurization is the process of killing microbes in the milk by heating to a very high temperature and then cooling it to a very low temperature

Answer 2

When sugar is breaked down , alcohol is formed and carbon dioxide is given out ,this is fermentation.
The process of heating milk to 70degree for half a min. And then coolong it quickly , this process is called pasteurization.