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17 cze 2023 · If you look at a 10 mL graduated cylinder, for example, the smallest graduation is tenth of a milliliter (0.1 mL). That means when you read the volume, you can estimate to the hundredths place (0.01 mL).
An irregularly shaped piece of a shiny yellowish material is weighed and then submerged in a graduated cylinder, with results as shown. (a) Use these values to determine the density of this material. (b) Do you have any reasonable guesses as to the identity of this material? Explain your reasoning.
Use the 10 mL graduated cylinder, which will be accurate to two significant figures. Mathematical operations are carried out using all the digits given and then rounding the final result to the correct number of significant figures to obtain a reasonable answer.
The uncertainty in a measurement can be expressed in two useful ways: a. as the absolute uncertainty in the last digit written b. as the percent uncertainty calculated as follows % uncertainty = 0.05 g x 100 =0.2 % 23.25 g The answer may be reported as: Exercise ABSOLUTE UNCERTAINTY AND PERCENT UNCERTAINTY F IN A SINGLE READING:
The uncertainty of a calculated value depends on the uncertainties in the values used in the calculation and is reflected in how the value is rounded. Measured values can be accurate (close to the true value) and/or precise (showing little variation when measured repeatedly).
12 cze 2008 · This page provides a table of typical uncertainty values for the calibrated volume of such glassware. Since these are based on the mean and standard deviation of the volumes delivered for a batch of glassware, they are treated as random errors.
Calculate the uncertainty of your measurement. Zero the balance, and record the mass of the graduated cylinder with water in Data Table 2. Repeat Steps 1–8 with the graduated cylinder for one additional trial. Repeat Steps 1–8 with the 250 mL beaker.
