Usuallym food items are preserved by cutting off their air supply using methods such as oiling, canning and vacuum packing. However, packets of chips are usually filled with a lot of air. Find out what this air consists of and the reasons why chips packets are filled with it.

Explanation

The air filled in chips packets is nitrogen gas. This gas keeps the chips from becoming stale as it hinders the growth of bacteria and other germs. If air was filled instead of nitrogen, oxygen present in the air would promote the growth of microorganisms resulting in the spoilage of the food. Therefore, the packets are filled with nitrogen gas and not air.