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The MASS of 1 liter of wine is slightly less than 1 kilogram. By definition, a liter of water (under certain assumptions about temperature and pressure) is exactly equal to 1 kilogram of mass. Wine is a mixture of mostly water, along with some alcohol, and minute quantities of other substances. Because water is the primary component, one would expect the mass of wine to be very close to that of water. But alcohol is somewhat less dense than water, so that part of the mixture has less weight than if it too was water. Therefore, because of the alchohol component of wine, the total density of wine must be slightly less than water, and therefore the mass of a given volume of wine will be slightly less than that of an identical volume of water.

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17y ago

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