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The idea is to divide the mass by the volume. I assume the half liter is what fits inside the bottle; in theory, the actual volume of the bottle plus the contents should be slightly more. Also, in theory you'll have to add a small amount of mass for the air inside. If the bottle is filled with air, then you'll actually get the average density of the bottle plus the air.

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Q: What is the density of a half liter water bottle that masses 20g?
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Is a bottle of water a mililiter or liter?

liter


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