Density problems are readily solved by algebra but the easiest method to use is the factor unit method. The definition of density is grams per milliliter, which can be thought of as so many grams equals one milliliter of the liquid.

In the metric system of measurement, the density of water is one gram per milliliter at 4^oC. Thus the conversion factor for water can be written either as 1g/mL or mL/1g and these factors can be used directly to solve density problems.

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