Sinking Soda?

Here's an easy experiment that illustrates the effect of density on floating. Get two cans of soda - one diet and one regular (with sugar). It's best if the two cans are the same size. Find a bowl or other container that is large enough to hold both cans and fill it about 3/4 of the way with water. Place both cans in the water and watch what happens, but be careful that the water doesn't overflow.

Both cans hold the same (or very nearly the same) volume of soda. Does one can feel heavier than the other? If you have a kitchen scale, weigh them. What can you conclude about the density of diet versus regular soda? And which floats better - the more dense or the less dense soda?