To calculate relative error, you must first calculate absolute error. Absolute error is the quantitative amount of incorrectness between an estimate and the actual value of a measurement, while relative error is a comparison between the absolute error and the total size of the measured item.
Continue ReadingTo calculate absolute error, subtract the experimental value, or estimate, from the actual value, and discard the negative sign, if applicable. To calculate relative error, divide the new number, the absolute error, by the real value. Because relative error is most often designated as a percentage, multiply this quotient by 100 to complete the calculation.
For example, to calculate the relative error of the distance from one tree to another, a person could pace off the steps in between the two trees and guess that the distance is 22 feet. If the actual distance between the trees is determined to be 21 feet 9 inches, the absolute error is 3 inches, or 0.25 feet. To calculate the relative error, divide 0.25 feet by the actual value, 22 feet, to get 0.01136. Multiply that number by 100 to determine the relative error, in percentage form, is 1.14 percent. This is a very low relative error.
Learn more about Chem LabThe melting point of polyethylene varies from 85°C to 145°C, depending on the type of polymer. Polyethene, which is another term for it, is a white and waxy polymer made up of only carbon and hydrogen.
Full Answer >Beakers are a type of cylindrical container used to mix chemicals, liquids and other substances together for scientific testing. They are also used routinely in laboratory experiments to calculate the volumes of various liquids. However, beakers are not the primary choice for measuring in labs, as they are only capable of providing figures within a 10 percent accuracy range.
Full Answer >Experimental research describes the process that a researcher undergoes of controlling certain variables and manipulating others to observe if the results of the experiment reflect that the manipulations directly caused the particular outcome. This type of research differs from a descriptive study, and another one of its important aspects is the use of random assignment.
Full Answer >Spatulas are used for measuring solids, moving objects and scraping material out of beakers. Spatulas can be used for more purposes as well, including slipcovers and weights.
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