Dear 100 Hour Board,
Why do soup cans have ribs? When you open up almost any canned good, the can is ribbed around the middle. I was thinking it might be so the product would come out of the can easier, but I disregarded this thought because the product fills those ribs anyway.
- Wonder Boy
The ribbing on the cans is to prevent the can from bursting in the center. Because of the way they're designed, the ribbing doesn't allow expansion they way a straight can would. This makes it so you can put a whole big stack of cans (in cases, usually) and not have the ones on the bottom collapse (usually).