- Jul 10, 2015
Perhaps there's a vacuum inside the can.
It's possible although an inert gas could also serve as a heat vehicle, also 1 bar or the weight of our atmosphere at sea lever is around 14 pounds per square inch, so a vacuum would exert force from outside of 14 pounds per inch, but an inert gas fill could be neutral pressure or just a fraction of a pound. It could simply be nitrogen which makes up 78% of the air around us, also I'm pretty sure that all moisture would be removed from the fill.
Facts from my smart brain word box :
By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.