Measurement Of Density And Density

1428 WordsFeb 22, 20166 Pages
MEASUREMENT OF DENSITY Lichang Wu Feb. 22, 2015 Abstract The purpose of the lab was to determine densities of materials. Density is the amount of matter in a given amount of space. Density is a physical property that is independent of the amount of material present. The formula for density is density=mass/volume(d=m/v). Introduction Density is a measurement of the amount of mass that have a specific volume. Density is used for identifying substances. Density is reported as g/ml or g/cm³. This lab will focus on measurements. Mass and volume are physical properties that can be easily measured. In the lab, the mass was measured in grams and the volume was measured in ml. Limitations on results The percent error when…show more content…
Based on the literature value of density, density of an unknown object could be identify by measuring the mass and volume. MEASUREMENT OF DENSITY Introduction In order to classify and identify materials of a wide variety, scientists use numbers called physical constants (e.g. density, melting point, boiling point, index of refraction) which are characteristic of the material in question. These constants do not vary with the amount or shape of the material, and are therefore useful in positively identifying unknown materials. Standard reference works have been complied containing lists of data for a wide variety of substances. The chemist makes use of this in determining the identity of an unknown substance, by measuring the appropriate physical constants in the laboratory, consulting the scientific literature, and then comparing the measured physical constants with the values for known materials. This experiment illustrates several approaches to the measurement of the density of liquids and solids. Density is a measure of the “compactness” of matter within a substance and is defined by the equation: Density = mass/volume eq 1. The standard metric units in use for mass and volume respectively are grams and milliters or cubic centimeters. Thus, density has the unit grams/milliter (g/ml) or grams/cubic centimenters (g/cc). The literature values are usually given in this unit. Density may be calculated from a separate
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