Friday, February 17, 2017

physical - Why are soft drink bottles round, and milk cartons square?


EDIT: The coke bottle I am referring to in the question is 1.25L.


Why are soft drink bottles round, but milk cartons square?


The milk carton is more utilitarian, being more space efficient, and having a handle for ergonomics. Why then have soft drinks not followed this design?



Is it a matter of aesthetics?


Could it also be to allow the user to drink direct from the bottle more easily?


enter image description here



Answer



Basically, coke with its gaseous nature, exerts more pressure per volume than Milk and to balance it out, round shape fits it well for coke, because round bottles take the pressure evenly, while square bottles get the corners chipped due to uneven pressure.


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