by 
pudzey101
ANSWERS: 6
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Because the liquid within them is cylindrical.
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round is stronger than other shapes.
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In this case I don't think it is a much a matter of strength as it is efficiency. Round shape have lower surface area to volume ratios. So, a cylindrical can requires less metal than a prismatic can. The most efficient shape would be a sphere, but that would roll too easily. ***************** "Bob Blaylock: Carbonated beverages produce pressure inside their containers. I think strength has everything to do with the fact that such beverages always come in round containers. Non-round containers would bulge out and become round anyway. "Bob Blaylock: You're always right, exept when I disagree with you. This is one of those rare situations. Non-carbonated beverages come in a variety of different shapes of containers. Carbonated beverages always come in cylindrical containers Comment on this answer" I am not saying that carbonation has nothing to do with it, but there are quite a few non-carbonated beverages that also come in round containers.
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This question is right in line with the classic "why are manhole covers round?". An extensive discussion of the topic can be found here: http://en.wikipedia.org/wiki/Manhole_cover#Why_are_they_round.3F
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They are round so they can roll off the assembly line. a square can of coke would create many problems.
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if the can is square the total volume of the can increases but if it is circular in shape the volume of the can decreases.....
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