Question

Define:
(1) Fermentation :
(2) Pasteurisation :​

Answer 1

1. the chemical breakdown of a substance by bacteria, yeasts, or other microorganisms, typically involving effervescence and the giving off of heat.
2. Pasteurization involves heating food to a temperature that kills disease causing microorganism and substantially reduces the levels of spoilage organisms . Pasteurization is not intended to kill all micro - organisms in the food . Instead pasteurization aims to reduce the number of viable pathogens so they are unlikely to cause disease ( assuming the pasteurized product is stored as indicated and consumed before its expiration date ) . Heat also destroy enzymes that make milk spoil , so pasteurized milk drinkable for longer time