Why Does A Can Of Diet Coke Float Sometimes But Not Always?
February 4th, 2010 | 
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This is what i can’t figure out. In science class my teacher filled a tank full of water and gently put a can of regular coke into the it. We observed that it sunk. Then he really gently held a can of diet coke over the water and submerged it almost all the way. Then he let go and it floated. He then took the the diet out and just dropped the can in, so it sunk like the regular coke. Why is it that it floated the first time but not the second?
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Tags: One Response to “Why Does A Can Of Diet Coke Float Sometimes But Not Always?”
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Regular Coke is full of sugar, which makes the liquid denser than water. The small head space in the can isn’t enough to float both the metal can and the heavier liquid, so it sinks.
Diet Coke is sweetened with a little bit of Aspartame, which hardly affects the density. The CO2 gas in the head space is just enough to float the weight of the can. If you dump out the Coke and fill the can fully with water, it sinks like anything else made of aluminum.