Why do straws float in cups with soda but not in water? Is it the carbonation? If so, why?
Also, why does soda sometimes come out of the straw after drinking from the straw? Is it a vacuum that hasn’t been properly unsealed?
In: Physics
The dissolved carbon dioxide forms (nucleates) in bubbles that affix themselves to the inside and outside of the straw, particularly where the straw’s surface isn’t totally smooth. These act as little buoyancy devices, and make the straw act as though it’s lighter than the soda around it.
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