What gas is used in crisp packets to keep the crisps fresh?

Here's why:

* Prevents oxidation: Nitrogen is an inert gas, meaning it doesn't react with other substances. This prevents the crisps from oxidizing, which would make them stale and rancid.

* Displaces oxygen: Nitrogen displaces oxygen from the packet, further slowing down oxidation. Oxygen is a key ingredient in the process that makes crisps go stale.

* Maintains crispness: Nitrogen also helps maintain the crispness of the chips by preventing them from becoming soft and soggy.

So, the next time you reach for a bag of your favorite chips, remember the crucial role that nitrogen plays in keeping them fresh and delicious!