Surprisingly no, google claims cans have been getting lighter but 15 grams empty is realistic, lets assume water at a gram per mL, 12 oz water is about 350 grams, that is about 5%, I don't remember the exact specific gravity of aluminum but its less than 3 (not a very dense metal...) so 5/3% by volume, roughly? This is all engineering estimates done in my head so exact numbers will be different but its not going to be orders of magnitude off.
A significant source of error beyond 1 sig fig is going to be the weight of ink/paint and the weight of the pop tab on the top. Also cans are not filled 100% with liquid, so there is air space (it has 12 ounces of liquid, but its a 12.something volume tank)
Something interesting to think about is fluid dynamics, a foam like this would stop sloshing at almost no weight penalty. If you like the idea of tin foil thickness gas and water tanks, then this would seem to be a requirement for that technology.
Well, the volume of a regular aluminum soda can is 375 cm^3 [1]. A modern can is about 15 grams of aluminum.[2] Just a really quick plugging it into Wolfram Alpha, the volume of 15 grams of aluminum is about 5.6 cm^3. [3]
So, that's about 1.5% aluminum by volume. So a soda can is about 98.5% air by volume.
> a foam like this would stop sloshing at almost no weight penalty
So would filling your gas tank with sponges; however, with that much surface area exposed to the liquid, I suspect it would be really hard to get the majority of the liquid back out.
A significant source of error beyond 1 sig fig is going to be the weight of ink/paint and the weight of the pop tab on the top. Also cans are not filled 100% with liquid, so there is air space (it has 12 ounces of liquid, but its a 12.something volume tank)
Something interesting to think about is fluid dynamics, a foam like this would stop sloshing at almost no weight penalty. If you like the idea of tin foil thickness gas and water tanks, then this would seem to be a requirement for that technology.