Knowledge
Refrigeration
Refrigeration and freezing are techniques used for preserving food in low temperatures. These procedures slow down or stop most bacteria from dividing and thereby multiplying, but do not kill them. The history of using cold temperatures for preserving food goes as far back as Palaeolithic times, when caves were used as places for storing food. Using a cold environment as a means of preserving food on a large scale dates back to the 19th century, with the invention of mechanical refrigeration.