Identification II - 1. Introduction The previous lab...

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1. Introduction The previous lab introduced you to mass, volume, and length measurements to calculate densities to aid in material identification. Often in science, the propagation of error, through instrumentation and testing variation, makes quantification challenging. To avoid such errors, many times standards with known values are used in a comparison study. How large were the uncertainties and standard deviations compared to the measured values from the previous lab? In this lab, you will be working with identification of polymers. Most polymers have densities between 0.90 g/ml and 1.4 g/ml. Here we will introduce the concept of specific gravity, which is a dimensionless ratio of the density of the substance in question versus the density of distilled water, thereby eliminating our need to report the units. The samples provided for this lab have small irregular volumes, making measurements difficult. Fortunately, we can ‘screen’ densities by simply immersing the substance in the liquid to see if it floats or sinks. The information provided in Table 1 will help. Of the ten samples given,
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This note was uploaded on 11/16/2011 for the course EMA 3080 taught by Professor Bourne during the Fall '10 term at University of Florida.

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Identification II - 1. Introduction The previous lab...

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