Comment on What are these bumps on the top of a pull-tab can?parentComments−Ferret74461yThat sounds... at least partially wrong?Pull tabs do not break the seal by pressing in to the can. They break the seal by pulling the lid up away from the can, where the "swivel" point is. The tab acts as a class two lever, where the "tip" of the tab is the fulcrum.https://en.wikipedia.org/wiki/Lever#Types_of_levers
Comments
That sounds... at least partially wrong?
Pull tabs do not break the seal by pressing in to the can. They break the seal by pulling the lid up away from the can, where the "swivel" point is. The tab acts as a class two lever, where the "tip" of the tab is the fulcrum.
https://en.wikipedia.org/wiki/Lever#Types_of_levers