There are many products available that contain gases and mixtures of gases stored in a pressurized steel container. You are probably most familiar with propane tanks that are used for cooking or grilling. These steel tanks may seem empty when you can no longer get a flame from them, but they often have small amounts of pressurized gas remaining.
![grilled yellow corn on a tray](/sites/default/files/styles/1024_x_601/public/2022-07/grilled%20corn%20hero.png?itok=kvvQf0i6)