Canning is a method of packing food into airtight jars or tin containers and neutralizing microorganisms with heat treatment to make it storable at room temperature for a long time. The airtight seal formed by the vacuum cuts off contact with air, preventing spoilage. Jam, tomato paste, and canned vegetables are produced with this method.
Where It's Used
“Can the tomato paste by filling boiling jars and turning them upside down.”