Question

where is the vaccum created in the can during canning of food items.....​

Answer 1

Answer:

by passing nitrogen gas

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Answer 2

Answer:

Filled with food, open containers are passed through an 'exhaust box' in which steam is used to expand the food by heat and expel air and other gasses. Obtaining a vacuum by injecting steam into headspace. The steam pushes the air out, then the can is immediately sealed. When the steam condenses, a vacuum is formed.