Sources suggest that unopened beer cans float in water! This is because the alcohol weighs less than water.
Do you know if regular and diet Coke cans float or sink in water? Due to the difference in density, the can with the sugar in it sinks while the diet can floats.
Based on a demo conducted by University of Pennsylvania - Physics & Astronomy Department, the density of a can of regular soda is just over 1 gm/cc, while that of a can of diet soda is just under. This makes for a dramatic display of density differences.
A 12-oz can of regular soda will sink in the same container of water in which the same brand of diet soda floats. Brand is not a factor, and only in the case of 12-oz aluminum cans does the small density difference straddle the density of water.
All plastic containers sink. The reason for the behavior is the presence of 39 grams (nearly 8 teaspoons!) of sugar dissolved in the water of the regular soda. It takes a much smaller mass of aspertaine (Nutrasweet/Equal) to flavor the diet soda. The effects of the air space in the can, and the mass of the can, combine with the liquid densities to end up just over and under the density of water.
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