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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one liter is always one liter it doesn't matter if it is in a water bottle or or a bucket
Density of water is 1000kg/m3. Also, Volume = Mass/Density = 1/1000 = 0.001m3. So, volume of water that has mass of 1 kg is 0.001m3.
A liter is a unit of volume in the metric system, equivalent to 1,000 cubic centimeters. An example of a liter would be a standard bottle of water, which typically contains 1 liter of liquid. Another example could be a liter of milk or a liter of gasoline, as these are commonly sold and measured in liters.
The density of water is greater than the density of ethanol. This is partly a result of how tightly packed the molecules of the substance are.
If the water is at standard temperature and pressure (25 degrees Celsius and one atmosphere), the water has density of 1 kilogram per liter. When submerged, the metal displaces its own volume of water. Therefore, the volume of the metal is 1 liter, and the density of the metal is 6 kg/liter.