History review 10: Compression theory and canning process.

Vapor-compression theory. A long time ago, people were using metal box filled with ice to store their food and drinks. Some of them had to travel 200 miles back and forth to get ice. William Cullen and Ben Franklin were first, who experimented with artificial cooling system, but it did not work at that time.Continue reading “History review 10: Compression theory and canning process.”