Percent Error. Percent Error At the conclusion of our time together, you should be able to: 1.Define experimental error, relative error and percent error.

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Presentation transcript:

Percent Error

Percent Error At the conclusion of our time together, you should be able to: 1.Define experimental error, relative error and percent error 2. Determine percent error for an experiment

How to Determine Experimental Error Error = experimental – accepted value

Percent Error % Error = (experimental – accepted) x 100 accepted value

Example of Percent Error Your instructor has just massed a penny using 3 different balances. One balance measured 2.3 g, another measured 2.55 g and a third measured g. Determine the average mass of the penny. 2.3 g g g = g ? 7.3 g /3 = g ? 2.4 g

Example of Percent Error Ex. Err. = 2.4 g – g = g Rel. Err. = g g = = % Err. = x 100 = -4.8 % error If the standard mass of a United States penny is g, determine the experimental error, relative error and percentage error in the measurements.

Percent Error Let’s see if you can: 1.Define experimental error, relative error and percent error 2. Determine percent error for an experiment

Exit Quiz Percent Error Your instructor has just measured the diameter of a dime using 3 different measuring devices. A ruler measured the diameter as 17.9 mm, a caliper measured 17.7 mm and a micrometer measured mm. Determine the average diameter with the correct number of significant figures mm mm mm = mm ? 53.7 mm /3 = 17.9 mm ? 17.9 mm

Exit Quiz Percent Error Ex. Err. = 17.9 mm – mm = 0.10 mm Rel. Err. = 0.1 mm mm= = 0.06 % Err. = 0.06 x 100 = 6 % error If the standard diameter of a United States dime is mm, determine the experimental error, relative error and percentage error in the measurements.