We’ve all been there. We get a delicious bag of chips that isn’t exactly all that cheap and open it up to find that the damn thing is less than half empty. Yeah, you know the deal. Great big puffy bag, but when you open it up and look inside, it’s nearly empty. What gives? Why all the useless air? Are we getting ripped off, or is there an actual reason for the air? Well, there actually is a good reason for it, and the air isn’t the type of air that you might be thinking it is. The air in potato chip bags is actually nitrogen.
Alright, I know. Nitrogen actually makes up the vast majority of the air that we breathe, so technically nitrogen as the air in potato chip bags is still air. But surely you must be wondering why just nitrogen? Why not just fill the bags with normal air like the stuff we breathe filled with all other gases? Well it all comes down to preservation.