I understand that the inside of a carbonated aluminium beverage can is pressurised. When the tab is pulled up,a rivet is lifted. Does this cause the can to depressurise? So then the can can be pierced with less force.
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Yes. You are correct. The can is first depressurized as the rivet is lifted allowing the lever action of the tab to pop open the scored can opening
Watch this short video showing this is detail: https://youtu.be/ekv0kprA3AY