A can of Diet Coke floats in water.

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Diet Coke
8 oz Diet Cokes by diaper, (CC BY 2.0)

Whereas a can of regular Coke sinks. Why? Simply because they use different sweeteners – regular Coke uses sugar and Diet Coke uses artificial sweeteners, which in turn affect the density of the drink. Diet Coke is less dense than regular Coke and water so it floats.

 

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