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"The top of the can is then added. This is carefully engineered: it is made from aluminum, but it has to be thicker and stronger to withstand the pressure of the carbon dioxide gas, and so it uses an alloy with more magnesium than the rest of the can"

Yes, but the pressure is the same on all parts of the can. Ok, almost the same, still.

Maybe because of the parts that have been cut to make it easy to open?




The top is (basically) flat.

The sides and bottom are curved.




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