The air in the potato chip bag is actually nitrogen

When you've picked up a bag of chips at the grocery store, you've probably noticed the bag is puffed and filled with 'air.' But it's not exactly like the air we breathe the package doesn't contain oxygen.

When processed food is exposed to oxygen, it deteriorates - oils go rancid, discoloration occurs and the food spoils. Oxygen can be removed from the packaging by removing all of the air with a vacuum, which will increase the shelf life of the food packed inside.

That’s why nitrogen is used. Nitrogen flushing is a process whereby all the air is removed from the bag and replaced with nitrogen gas. The nitrogen doesn’t affect the taste of the food and doesn’t react with it like oxygen does, so the food stays fresher longer. And, since the nitrogen gas fills up the bag, the contents inside are protected during shipping.