The logic is to divide the value of kg/m 3 by 1000 to get pure water. In other words, at the same temperature, the density of water in g/ml (or g/cm 3) is 0.99777. State whether each of the following will sink or float when placed in water. At room temperature (i.e., 22° C), the density of water in kg/m 3 is 997.77. Water has a density of 1.0 g/cm3 at room temperature. We would therefore still need to report the answer to three significant figures, 0.0551 mL. With respect to the definition, the density formula is represented as Density () Mass (m)/Volume (V). Although the mass we are starting with now has four significant figures, the density we are using as a conversion factor still only has three significant figures. Consider, for example, if we had tried calculating the volume of 0.7500 g of mercury in the previous example. To calculate the density, divide the weight by the volume: 9 g / 37.5 cm3 0.24 g/cm3 240 kg/m3. Water has its maximum density of 1g/cm 3 at 4 degrees Celsius. Also, pure water is less dense than seawater, so fresh water can float on top of salt water, mixing at the interface. A consequence is that ice floats on water. Unlike most substances, water is denser as a liquid than as a solid. Bulk density can be used to calculate soil properties per unit area (e.g. Sandy soils are more prone to high bulk density. Bulk density increases with compaction and tends to increase with depth. Soils with a bulk density higher than 1.6 g/cm3 tend to restrict root growth. The significant figures in the density must therefore be considered when determining the significant figures in any answer calculated using it. Note that the density of pure water is defined to be 1 gram per cubic centimeter (or, g/ml). Finding Density of substance Mass of the substance 50 g Volume of the substance 20 cm3 Density of substance ( )/ ( ) 50/20 2.5 g/cm3 And Density of water 1 g/cm3 Since, Density of substance. Bulk density is the weight of soil in a given volume. \]ĭensity is a measurement, and like any measurement it contains some error.
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