Step 1 : Introduction to the question "2. Which food preservation method consists of chilling foods, but not to the point of freezing them?"
...1. Salting 2. Refrigeration 3. Bottling 4. Drying In 1756, William Cullen demonstrated the first known method of artificial refrigeration. In 1758 Benjamin Franklin and John Hadley found that by evaporating volatile liquids, the temperature of objects could be reduced quite rapidly - even past the freezing point of water. The first commercial refrigerated shipping occurred when a refrigeration unit was fitted to a 'Dunedin', a New Zealand vessel, in 1882 - this lead to a boom of dairy and meat between countries in the southern hemisphere, such as Australia and South America. Refrigeration helps to preserve fresh foods by slowing the growth of micro-organisms that cause food to rot.
